CC INTERNATIONAL-Crafters Companion Rock-A-Blocks. These wonderful stamping blocks are not your ordinary square acrylic blocks! This set of four blocks have a rounded surface with depth gauges on the edges so even the most unsure; unsteady of stampers can leave a clean crisp image behind. These two transparent purple plastic blocks feature a centering grid on each block: 4-7/8 by 7-3/8in and 2-3/8 by 7-3/8in. (Stick & Spray aerosol mounting adhesive may be required to adhere unmounted stamps to these blocks). Imported.