3L Scrapbook Adhesives 3D Foam 126 Squares are great to create a 3D effect on your ATCs, photo album, greeting cards etc. 1/2 in. 1/2 in. rounded corner black squares. I love these because they are small and are great to make those embellishments and images POP! They are easy to use, you just peel and stick. These wonderful acid-free, archival safe, permanent squares are perfect for adding all those non-stick embellishments quickly and easily.