Small and light aluminum alloy material High hardness, metallic luster, not easy to rust, lightweight and durable aluminum alloy material is more conducive to heat dissipation The Aluminum Case the metal shell is more conducive to heat dissipation, and comprehensively protects your motherboard. Full package and full protection After repeated testing, each hole is highly matched to the motherboard, and the protection is more thoughtful Specially made for raspberry pie 4b, raspberry pie 4b is different from 3b+/3b interface, and the shells are not common to each other Applicable model: For Raspberry Pi 4B Colour:black Material:Aluminum alloy Package Contents: 1 x Aluminum Alloy Upper Cover 1 x Aluminum Alloy Lower Cover 3 x Thermal Pad 1 x Wrench 1 x Cooling Fan 8 x Screw Only 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.