I searched and searched for HDPE and/or Teflon.  Since HDPE is much cheaper, and has a very low friction coefficient, I choose this product.  This is the best price I have found out there, even beat my local plastics supplier.  I purchased this produce to line the inside of a project I'm working on where I need to very easily side an acrylic tray in and out.  This product did the trick, I'm very pleased.