Plastic Clip Board 1.PP 3-layer Foam Board made 2.Wire clip mechanism 3.Diff. colors and ... thickness 4.100% recyclable Durable Waterproof PP-3 Layer Plastic Clip Board/ customized clipboard/metal clipboard: PP 3-Layer Foam ... high intensity, 100% recyclable material2. 25% lighter than general PP board, waterproof, durable3. High heat resistance, excellent chemical resistance, insulation properties ...