Please notice: THe raspberry pi motherboard is not included!Compatible with the raspberry pi 3 b+ and 3 model b. This will be the best choice for your raspberry pi. It’s perfect for program learning and observe the data at the same time. Great way to get a lot of Pi's working together. Easy to assembly, which is good for beginner to access to raspberry pi rapidly. This is a stacking case. It can divide to 2, 3 or 4 cases. It’s really multifunctional. There are SD card slot and bottom heatsink cutout in the bottom plate. This is very convenient to insert and remove. And a tweezers is also provided to help you install the screw or SD card. Two big heatsinks and one small heatsink are provided for per layer, totally 8 big heatsinks and 4 small heatsinks. SIZE One layer case ( consist of two plates) : 117*82.7*46 mm Four layers case : 117*82.7*146.2 mm Please peel off the protect paper before using. Tips: Screwdriver is the best tool to take off the film. Heatsink Big size : 14*14*6 mm Small size : 8.8*8.8*5 mm Please peel off the protection tape, there are aluminum part, thermal adhesive and tape , do NOT take off the thermal adhesive and tape together. Screws Long Copper pillar: 37*5.2*5.2 Short Copper pillar : 11*5.2*5.2 Screw nut: 6.2*5.9*5.9 Tweezers : 103*9*4 mm outer package : 215.7*164.3*8.1 mm Package : dog bone plate x 5 Heatsink x 12 (big hs x 8, small hs x 4) Screw set x1 Tweezers x 1 Screwdriver x 1 Installation instruction x 1