... , China 4.Competitive price 5.Many sizes available Alumina Ceramic FerruleMullite Ceramic FerruleZirconia Ceramic FerruleFeatures:1. Good resistance2. Small tolorence3. Raw material ... Best quality5. Many sizes available 6. Certificates: SGS, ISO Toho Ceramic Technology Co., Ltd (TOHO) locates in Lianyungang, Jiangsu Province. TOHO ... interested in our products, please contact with us! Threaded ferrule