Well I'm not sure if they call it puck board, its what is used on the inside of hockey rinks, but its 1/8" thick sheet of plastic, very strong stuff, just dont let the cabinet freeze as this stuff expands and shrinks and may crack, I dont think 1/8" will because its so thin, but 1/4" does for sure I know. Are you from the states? its a common thing here in canada, I bought it from totem i believe. I lined the inside of the cabinet with coroplast, made it brighter and this way the wood doesn't get wore down from blasting over time ( partical board might flake off and cause problems was my reasoning) there is a sometimes a smooth side to it as well, and a rough side, make sure the smooth side is to the inside of the hopper.