Our 51 x 49 x 73 3Mils Pallet Covers All our black pallet top covers on a roll are made of 100% virgin Low Density Polyethylene (LDPE) resin that meet FDA/USDA specifications. Easy dispensing with perforations between bags. Tubular construction throughout with a durable bottom seal, make these bags the best on the market. This premium bag features UVI/UVA to protect the film and its contents from damage from the sun. Wound on a 3" core with 1" diameter core plug.