1. Made of aluminum alloy, anti-corrosion, anti-oxidation, good thermal conductivity2. Based on CM4 motherboard design, it is a special heat sink for CM43. Match the size and positioning hole of CM4 to quickly dissipate heat4. Reserve antenna holes and slot the antenna area5. Easy to install and use, convenient and fastProduct name: heat sinkUse model: suitable for Raspberry Pi CM4 dedicated heat dissipationcolour: blackMaterial: metalSize: 55x40x5mmPackage Contents:1 x heat sink1 set x installation accessoriesOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.