The pucks are made of Ultra High Molecular Weight Polyethylene. That means they are incredibly strong and lightweight. The pucks are 5/8" thick and will take a long time to wear down. The pucks are super smooth and predictable slide right from the start.
Rectangular Pucks are 2.8" x 3.25" and are great for the fast freerider or downhill racer looking for a reliable puck at high speeds.