Black HDPE Block Plastic Sheet High Density Polyethylene Rectangular Solid Tapping Block High Density Sheet for DIY Projects (3/4 x 3 x 3-1/2″, 2 Pcs). Material: HDPE. Wide Applicability and Precision Machining: Beyond floor fitting and laminate tapping, the black HDPE plastic sheets are versatile, suitable for DIY projects and precision machining through techniques like CNC machining, bending, and heat gun shaping.