Description:The Heat sinks have a layer of adhesive on the back of them.This heatsink set is specially designed for Raspberry Pi 2, Raspberry Pi B/B+, Raspberry Pi A/A+, South Bridge, North Bridge, VGA RAM, MOSFET, DC Boost Power Converter, Power Converter, LED Light etc.It's function is to cool down the board and make your Raspberry operate safely and Reduce the risk of hardware failure because of overheating.Package Included: 8Pcs 14x6x14mm Heatsink, 8Pcs 20x10x20mm Heatsink, 8Pcs 8x5x22mm Heatsink, 16Pcs Tape, 1Pcs Conductive Adhesive.100% Brand new,high qualitySpecification:Material: MetalSize: Approx.14x6x14mm/ 0.55x0.24x0.55 inchSize: Approx.20x10x20mm/ 0.79x0.39x0.79 inchSize: Approx.8x5x22mm/ 0.31x0.20x0.87 inchPackage Includes:8 Pieces14x16x14mm Heatsink8 Pieces 20x10x20mm Heatsink8 Pieces 8x5x22mm Heatsink16 Pieces Tape1 Piece Conductive AdhesiveNote:Please allow 0.1-0.5 inch difference due to manual measurement.(1 inch=2.54cm)Due to the difference between different monitors, the picture may not reflect the actual color of the item. Please understand,Thank you.