uxcell 5 Pcs Black Aluminum Adhesive Radiator Heatsink Cooler Block 19mm x 19mm x 5mm Package Content : 5 x Heatsink Material : Aluminium Overall Size : 19x 19x 5mm/ 0.75" x 0.75" x 0.2" (L*W*H) Adhesive thermal tape backing Can be applied with other devices such as the BeagleBone