Nov 29, 2022 · Product Description. Machine grade plastic blocks 2 inches thick, 6 inches Long and 6 inch width. Choose any 2 lors from natural, red, orange, purple, lime green, or forest green. IF NO SPECIFIC LORS ARE REQUESTED, 2 RANDOM LORS WILL BE SENT TO YOU. HDPE (High-Density Polyethylene) has a low efficient of friction and can be easily cut