We currently only offer products that can ship smoothly within the US, which helps us avoid unexpected customs duties and fees landing on customers. Because of that, not every size is available in every profile or material.
For example, you might see an 8×10" canvas available in the slim 19mm (0.75") profile but not the gallery-depth 38mm (1.5") profile. That's down to what can reliably ship to US addresses from our print partners, not a limit on your piece itself.
If there's a specific size or format you want and you don't see it on the site, email us at hello@ephe.art. Tell us what you're hoping for and we'll see what we can do to get you the art you want.