Description: 100% Brand new and high quality, Suitable for high-power audion, field-effect tube, Voltage Regulator Module(such as LM78XX/LM317XX, etc. ), all kinds of audio power amplifier module(TDAXX), high-power silicon controlled rectifier module(OmronXX), the integration of rectifier module, etc. The pads and insulating particles have good electrical insulation and thermal conductivity properties Ideal for mounting TO-220 package power devices to a heat sink. Insulator Pads Material: Silicone Elastomer Size: Approx. 20*21MM/0. 78 * 0. 82 inch Package includes: 10 x Silicone Pads 10 x insulating particles