eBay
for 4 Aluminum Case with Dual Cooling Fan Metal Shell Black Enclosure for 4 B h

https://luckyretail.com/Uploadfile/202005102/930020B4/930020B4-90.jpg

Description:
This list include the case for the latest B and the case for 3 +
The Case is made of Aluminum Alloy with machining manufacturing technology. cool design and good-looking are liked by makers
It includes the dual fan and thermal tapes which reduce the temperature for board
There are four screws for you to fix the case with board, pls the installation instruction.
Compatible With:
Accessory Type: Cases
Dual Fan:
Low Consumption Design.
Very Quiet Cooling Fan, You Can Hear Even Nothing.
Thermal Tape Can Make Best Heat Conduction Effect.
For Aluminium Alloy Case and Heatsink:
Perfect Size for 3B 3B+
Big Size Heatsink and Cooling Fan Can Make : No More Overheating Problem.
High Quality Aluminium Alloy Case Can your Safe.
Open Design Can Make Our Case will not effect Wifi Signal.
Colour: Black
Material: aluminum alloy casing
Package Contents:
1 * radiator
1 * set of mounting screws