Packing: 2PCS x Heat Management Device Height: approx 1.02inch. Base Width: approx 3inch. Material: Aluminum alloy. The Heat Management Device made of Aluminum alloy is perfect for smoking with phunnel bowls.The sleek design and good functionality combine in perfect synergy to create a perfect heat distributor. NOTICE: NEVER PREHEAT YOUR HMD. Just add coal (2/3 pieces as per your preference) and wait 5-7 minutes.