Our sheets are made of natural HDPE measuring .0625 (1/16th) inch thick. As Popular Mechanics says...
How it works: High-density polyethylene (HDP) is among the most slippery solid substances known to man, and it's also among the toughest. Place any heavy load on this HDP plastic sheet, and you've got a sled that moves heavy loads like nobody's business.
Why it matters: A wheeled platform of some kind (i.e. the hand truck, wheel barrow or dolly) is handy but imperfect. If you're working alone, how do you get the load on to it in the first place? With this mover, you simply tip and pivot the load onto the sheet, then slide it where it needs to go. It moves loads up to 500 pounds over carpet, grass or even rough concrete or dirt.
Our handles are HDPE, attached with stainless steel screws
Pipe/extension handles are PVC
Ropes are marine-grade polypropylene
Heavy Duty Trays are UV-stabilized HDPE