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 transparent purple plastic blocks feature a centering grid on each block: 3-7/8x5-7/8in; 1-3/8x5-7/8in; 2-7/8x4-1/16in; and 1-3/8x1-7/16in. (Stick & Spray aerosol mounting adhesive may be required to adhere unmounted stamps to these blocks). Imported.