Simply press the footwear onto the BIO-FOAM surface, spray on a thin coating of Aerosol Dust & Dirt Hardener (Cat. No. 638CA), and then mix and pour in Shake-N-Cast (No. SNC42) ready-to-use casting material. This makes a permanent impression of the footwear. The high-density foam provides extremely fine detail and comes packaged in a self-storing cardboard container. Case of 24 Impression Kits.