21x49 3D Pro 3.5" Deep K3 Stretcher Frame Kit

True 7:3 Extended Domino Proportion - 21x49 Size

This 21x49 is a unique Masterpiece size and 7:3 Extended Domino aspect ratio.

The 7:3 aspect ratio brings a bold and dramatic horizontal stretch, perfect for wide compositions that need to feel expansive and open. This format pulls the eye across the canvas, making it ideal for landscapes, cityscapes, or any scene where horizontal flow is essential. The narrow vertical space adds a layer of complexity, requiring careful use of vertical elements to maintain balance without overwhelming the composition.

There’s a natural tension in this ratio. The wide format invites exploration of the edges, creating a sense of openness, while the limited height keeps the scene intimate and controlled. It’s a format that encourages you to emphasize sweeping gestures, long vistas, or minimalist abstractions. It's great for conveying motion, distance, or the vastness of a scene, all within a strikingly sleek frame.

Explore other sizes in this same 7:3 aspect ratio:

12x28 • 15x35 • 18x42 • 24x56 • 27x63 • 30x70 • 33x77 • 36x84 • 39x91 • 42x98 • 45x105 • 48x112 • 51x119

3D™ Pro 3.5 Stretcher Bar • 1/2" Canvas Clearance

1/2" Canvas Clearance is the space between the Bar and the canvas. Generally speaking, more clearance reduces the risk of the canvas touching the wood and creating unsightly lines during painting. Our design provides the optimal clearance so as not to impact your painting, but still leaving enough wood to the maximize strength of the Stretcher Bar.

• Produces a 3.5" deep stretched canvas (Actual depth is slightly thinner)
• 1.25" wide Stretcher Bar
• All Bars have an exclusive groove on the inside perimeter of the frame to which cross braces and Diamond Corner Braces attach
• Solid Ponderosa Pine or Fir from the Pacific Northwest

No Finger Joints!

Solid Wood is far superior to finger jointed wood, which is many small pieces glued together, each with varying grain densities that absorb and shed moisture at varying rates, expanding and contracting non-uniformly as environmental conditions change, and causing the wood to bow and the finger joints to eventually fail.

A single homogeneous kiln-dried solid wood Stretcher Bar outperforms and outlasts a finger jointed Bar whose sole purpose is to save the manufacturer cost, not contribute to the archival value of artwork intended to last a millennium. As a manufacturer, Masterpiece® does its part to conserve as much wood as possible, and still provide a quality product that will out-perform any other in the marketplace.

• Super strong 3D™ Pro K3™ Stretcher Bar is a very popular among contemporary artists whose painting will be displayed without a frame.
• For this 21x49 large size frame, the frame provides the ultimate foundation for your art with increased strength and stability
• Provides a 3.5" deep stretched canvas which makes a bold and commanding display
• 1-1/4" wide Stretcher Bars
• All Bars have an exclusive groove on the inside perimeter of the frame to which cross braces and Diamond Corner Braces attach
• Solid Ponderosa Pine or Fir from the Pacific Northwest

Sustainability Promotes Social Well-Being

The forests of the world are a precious resource that must be protected for future generations. By using lumber from sustainably managed forests in our products, we can help to ensure that these valuable resources are preserved and protected. This is not only important for the environment, but also for the social and economic well-being of the communities that rely on these forests for their livelihoods.

Specially Dried and Heat Treated Lumber

We source our wood from a select group of top-tier environmentally conscious lumber mills in the Pacific Northwest. These mills specially dry and heat-treat the lumber to our specifications, resulting in about half the moisture content compared to wood from typical home improvement centers or lumber yards. This process makes the wood stronger, reducing the likelihood of cracking, splitting, or warping. While the wood we use comes at a higher cost, it ensures a more dimensionally stable end product. This stability is crucial for crafting fine professional canvases that support your invaluable art over time.

31x59 is the Canvas Size Needed for this 21x49 Frame

Please note that you will need a canvas that is at least 10 Inches larger than the actual frame size to ensure proper stretching. This will provide ample material to stretch the canvas and attach it to the back of the frame. If you prefer to attach the canvas from the edge of the stretcher frame, you can reduce the size of your canvas by approximately 3/4" all the way around the frame. This will allow you to paint on the edge of the canvas and hang your artwork without needing a separate picture frame. And, if you ever need to remove the canvas from the frame and re-attach it, you'll have enough material to do that too.

Rooted in California and flourishing since 1965, Masterpiece® takes pride in its family-led legacy of crafting North America's premier Stretcher Bars. Our quest for excellence isn't just a goal but a commitment, positioning us as the trailblazers in the domain of fine-art canvas. Our innovative patents have set new benchmarks, ensuring our offerings stand unmatched. Dive into the tactile experience of our products, and you'll instantly recognize the distinct Masterpiece® quality, a signature appreciated by both your clientele and future art connoisseurs.

There is always a heavy demand for fresh mediocrity. In every generation, the least cultivated taste has the largest appetite. ♦ Paul Gauguin

Throughout his life, Gauguin often faced the challenges posed by a society that often preferred the familiar to the avant-garde. He knew, as we do, that novelty often attracts attention, even if it lacks depth or substance. We artists constantly balance between catering to the prevailing tastes and staying true to our authentic voice. It's a dance, a negotiation between the world's expectations and our innermost desires.

Yet, Gauguin's work and his legacy remind us of the importance of prioritizing authenticity over fleeting trends. While there might always be a market for what's easily digestible, it's the art that challenges, provokes, and makes one think that leaves a lasting impact. We must, therefore, seek to cultivate our unique voices, ensuring that our art stands the test of time.

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Art is visual and ripe with meaning, so enjoy this quote and our interpretation of its meaning, plus an one-of-a-kind portrait we created of Paul Gauguin to make it all the more relevant. Pick up that brush and go!