We can offer various specs of ceramic seal discs, which can be used in many kinds of faucets. Material: 95%--99% alumina Size: According to customers' request The frictional times are 300, 000 to 500, 000, the density is3. 6~3. 7g/cubic centimeter, the rigidity is 84~86 HRA, the thickness tolerance is less than 0. 02mm, the diameter tolerance is less than 0. 02mm, meanwhile, we an manufacture according to customers' drawings or samples. Looking forward to cooperation with you.