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Description:We can offer all kinds ceramic seals and catridges, which can be used in all the faucets, pumps, and many other places. Features: 1) Material: 95%-99% alumina 2) Size: according to customers' request 3) Price: carious according to different materials and measures 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 can manufacture according to customers' drawings or samples.