Product Name : Silicone Thermal Pad Sheet; Fit for : Package TO-3P Transistor Material : Silicone; Color : Gray Each Size : 2.5 x 2 x 0.03 cm / 1" x 0.8" x 0.01 (L x W x T); Hole Diameter : 3mm / 0.1" Between electronic components such as Semiconductor, IC, CPU, MOS and heatsink. Led Lighting, LCD TV, Telecom device, Wireless Hub, Power supply etc. Cooling Modules, Thermal modules, in all applications where a metal housing is used as heatsink. Package Content : 50 (+/-2) x Silicone Thermal Pad Sheet Note:Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.