Features: Ultra-thin design Easy to install Fast Heat dissipation Smooth and straight aluminum material All ports and slots of the case can match with Raspberry Pi 4 Computer Model B perfectly Open case design, you don't need to worry it will effect wifi signal any more Reinforced aluminum material, lightweight and durable, long-lasting stainles We use silicon cooling pad (the thickness is only 0.5mm) to Contact the shell body to dissipate heat. You can use the CPU grease to relace the silicon colling pad to get better heat dissipation. Note: The Raspberry Pi board is not included Colour: Black Material: aluminum alloy Package Contents: 4 * Raspberry Pi 4 Model B Aluminum Case 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.