Plastazote is a closed cell foam, the closed cells hold air which means more buoyant patterns. The Semperfli Plastazote Block are much thicker than closed cell foam sheets at 28mm thickness making them great for booby eyes, detached bodies, shell backs or anything else you want to float. Easily cut Semperfli Plastazote blocks are available in a full range of colours with each block measuring approximately 1" x 3" x 6".