Made of Blend Materials, good thermal conductivity, can reduce the risk of failure due to overheating. The fins increase the area of the board, let a maximize surface area with the cooling air thus provide for greater heat transfer, also they have profiles which are short enough to fit within the cases. Compatible with Raspberry Pi 3B. Feature - Color: White. - Material: Blend Materials - Size: 1.50X1.50X0.60cm/0.59X0.59X0.24in Blue Heat Sink(3 Pieces): 9 * 7 * 12 mm / 0.3 * 0.2 * 0.4 inch Black Heat Sink ( and Two Small): 14 * 14 * 6 mm / 0.5 * 0.5 * 0.2 inch ( ) 9 * 9 * 5.2 mm / 0.3 * 0.3 * 0.2 inch (Two Small) Silver Heat Sink ( and Two Small): 14 * 14 mm / 0.5 * 0.5 inch ( ) 8 * 8 mm / 0.3 * 0.3 inch (Two Small) Blend Materials Heat Sink(3 Pieces): 14 * 12 * 5.5 mm / 0.5 * 0.4 * 0.2 inch - Double-sided thermal transfer tape, offers high thermal conductivity and adhesion in all mounting scenarios - Higher thermal conductivity, Heatsink thermal conductivity higher than Stainless Steel Heatsink, Heatsink thermal conductivity higher than brass heatsink. O have more better thermal conductivity - The fins increase the area of the board, let a maximize surface area with the cooling air thus provide for greater heat transfer, also they have profiles which are short enough to fit within the cases - Fit for Raspberry Pi 3B, fit with the Processor, Memory chips, LAN 9514 Chips and other chips. Easy to install, easy to use Package list: 9 x Blue Heat Sink 3 x Black Heat Sink ( and Two Small) 3 x Silver Heat Sink ( and Two Small) 3 x Heat Sink