Rock-a-Blocks by Crafter's Companion are an innovative and unique rubber stamp mounting system designed to make stamping easy. Time to throw away those acrylic blocks! With Rock-a-Blocks, you'll get perfect results every time you stamp. Sizes include:• 15cm x 10cm• 15cm x 3.17cm• 10cm x 7.5cm• 3.8cm x 2.5cm Rock-a-Blocks have a curved face and an innovative depth gauge which means that when you stamp, the pressure applied to the paper is even, ensuring a consistent application of ink. All you need to do is apply a gentle rocking action to Rock-a-Blocks and you'll get perfect stamped impressions every time. Product Information:• Rock-a-Blocks• Rubber stamp mount• Pack of 4• Innovative design• Brand: Crafter's Companion