Overall Size: 5 x 25 x 25 mm / 0.2 x 0.98 x 0.98 inch; Color?Black. This heatsink come with thermal conductivity adhesive ,which can provide good cooling results. Effectively for cooling 3D printer, the motors couldn't sink heat into the frame, and heatsink will reduce the temperature of stepper motors. Easy to install, it only take seconds to install. Package Content: 4 x Heatsink.