HIRST ARTS MOLD #40 - BASIC BLOCK   - "Used for building simple walls and structures. Contains several long one-piece blocks." Skullcrafts only uses gray Merlins Magic to produce top quality castings of Hirst Arts molds. Great care goes into each and every cast to ensure that all bricks are bubble free and all the same sizes. Alternately, you can directly buy Mold #40 from Hirst Arts to cast your own basic blocks and order Merlins Magic from Clint Sales and Mfg. Skullcrafts is a fully licensed legal seller of Hirst Arts casts, kits and assembled & painted pieces.