LITS China Ceramic Deep Groove Bearings Si3N4(with PTFE Seals) Inner and Outer rings:Silicon Nitride Ceramic (Si3N4) Retainers:PTFE Balls:Silicon Nitride Ceramic (Si3N4) Seals:PTFE (Typical Examples) Heat-resistant 180C --- Inner & Outer ring : ZrO2 / Retainer:PTFE / Balls:ZrO2 Heat-resistant 400C --- Inner & Outer ring : ZrO2 / No Retainer (Full complement of balls) / Balls:ZrO2 Heat-resistant 1100C --- Inner & Outer ring : Si3N4 / No Retainer (Full complement of balls) / Balls:Si3N4Ball Door to Door international express delivery SHANGHAI LITS mainly exports ceramic bearings, plastic bearings and so on. LITS bearings have been exported to not only Japan but many other countries and regions as well. We look forward to doing business with you.