dia.25mm thickness: about9mm We offer various of ceramic discs, used in many kinds of faucets. Material: 95%~96% alumina. Size: According to customers' request Price: According to different sizes, materials The frictional times is 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 ...