Seibi (Huzhou) Communications Technology Co., Ltd., leading brand is 'Seibi', have already got the ISO9001: 2000 certificate. We can manufacture all kinds of zirconia ceramic sleeve for fiber connector, and it's of high precision (1 um). As for Zirconia products, they have a stable chemical performance. Our monthly production ability at present is about 3 million standard sleeves and 600, 000 non-standard sleeves. At the same time we can produce the zirconia ceramic pin gauge/plug gauge and ceramic stick(could be controlled at 1 um), structural ceramic products, and we can make all kinds of osa receptacles according to customers' needs.