The Premium Slim PC pedals feature the slim shape and profile with a mild concave platform and are made from an ultra-strong polycarbonate plastic. It measures 15mm at the thinnest point and 20mm at the thickest and has a micro-knurled texture with 8 molded pins on each side. The Slim PC pedals have a chromoly spindle with two sealed outer bearings and inner bushing to increase durability and reliability thus creating a smooth rattle free pedals. 9/16"