Search 'Box Material' in the search field in the upper right hand corner of the page, you should find plenty of responses there. HDPE, Lexan and Teflon all slide well.
'Thanks for ripping off my friend. He has a magnum.' - SkogenJake
'I was like a 13 year old girl meeting a backstreet boy' - Ski@Jaypeak2 ... on meeting Glen Plake