5/8 professional high density plastic board whosesaler-HDPE HDPE (High Density Polyethylene) Plastic Sheet 3/8" x 5" x 10 HDPE (High Density Polyethylene) Sheet, Opaque Off-White, Standard Tolerance, ASTM D4976-245, 0.5" Thickness, 12" Width, 12" Length 4.7 out of 5 stars 189 2 offers from $15.24