This is a vacuum cup or the heating cup pad heating pieces, which is adopted with high grade PI film/steel disc material, it can withstand the using. It has the wide range of application, very practical and useful. Features - Color: Yellow. - Material: PI film/steel disc. - Size: 4.50X4.50X0.01cm/1.77X1.77X0.00inch. - Maximum voltage: 5V. - Room temperature resistance: 1.5 . - They are through high temperature high-pressure and heat-sealing process. - Widely used in electronics manufacturing, medical devices, scientific instruments. - With the round shape design, it is very suitable for the vacuum cup or the cup pad. - After you're using it, you will be surprised at its practical function. - It has the enough number, you can share them with your family or your friends. Package list: 10 x heating pieces