With over 54 years of experience, Alvin is one of the primary sources for drafting supplies and drawing equipment in the country. Together with this core group of products, we continue to meet the needs our customers with our expanding range of fine art, hobby and craft supplies, our large selection of drawing room furniture, and our wide assortment of exclusively-designed products. PIONEER-Self-Adhesive Photo Squares. Adhere photos; journaling shapes and more with ease: just press on and these handy little acid free squares will hold your photos and more in place for years of protection. This package contains 500 1/2in squares. Imported.