21x28 3D Pro 3.5" Deep K3 Stretcher Frame Kit

True 4:3 Cinema Proportion - 21x28 Size

It's intriguing to see size so close to the very popular 22x28 size, just one inch different and in the 4:3 proportion.

Explore other sizes in this same 4:3 aspect ratio:

12x16 • 15x20 • 18x24 • 24x32 • 27x36 • 30x40 • 33x44 • 36x48 • 39x52 • 42x56 • 45x60 • 48x64 • 51x68 • 54x72 • 57x76 • 60x80 • 63x84 • 66x88 • 69x92 • 72x96 • 75x100 • 78x104 • 81x108 • 84x112 • 87x116 • 90x120

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 21x28 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 Fights Against Climate-Change

Sustainable forestry practices are an important tool in the fight against climate change. By using lumber from sustainably managed forests in our products, we can help to reduce the carbon footprint of our business and support the health of the planet. It's a win-win for everyone involved.

Specially Dried and Heat Treated Lumber

Our wood is handpicked from a curated group of environmentally responsible lumber mills in the Pacific Northwest. By adhering to our precise drying and heat-treatment standards, these mills produce lumber with nearly half the moisture you'd find in common home improvement outlets or lumber yards. This meticulous process not only enhances the wood's strength—minimizing risks of cracks, splits, or bends—but also elevates its dimensional stability. Such quality, despite its premium, is paramount in creating professional canvases designed to uphold the sanctity of your cherished art throughout the years.

31x38 is the Canvas Size Needed for this 21x28 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.

Masterpiece® is a family-owned business operating in California since 1965 and producing the finest Stretcher Bars in North America. We deliver the highest quality and highest performing products in the business. We are widely recognized as the nation's leader and trendsetter of professional quality fine-art canvas. We own several patents that make our products perform superior to any other on the market. Once you touch one of our products, you'll immediately recognize our impeccable quality—and more importantly, so will your clients and those who acquire your art

The only source of knowledge is experience. ♦ Albert Einstein

Whose groundbreaking theories forever altered the landscape of physics, Albert Einstein believed deeply in the transformative power of experience. This iconic scientist, though often enveloped in the abstract world of mathematical formulas and theoretical constructs, recognized that true understanding is rooted not just in cerebral contemplation but in lived experiences.

In the world of art, this sentiment strikes a chord. While techniques can be taught and skills honed through repetition, the depth and authenticity that define a masterpiece stem from the artist's personal experiences. As we craft our pieces, our past encounters, emotions, and memories seep into every brushstroke, creating a tapestry that is as much a reflection of our lives as it is of our skills. To truly connect with our audience, it is paramount that we draw from the well of our own experiences, allowing them to shape and color our creations, ensuring that every piece is imbued with the richness and depth that only firsthand knowledge can impart.

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Celebrating the creativity in all of us, we've taken a step provide these words of wisdom and to immortalize Albert Einstein through our own unique portrait. Pick up your brush and create!