Item No.: SGE15ET-2RS~SGE60ET-2RSInner Race: 440C Stainless steel,heat treated,precision ground. Outer Race: 304 Stainless steel,with liner of PTFE fabric Sliding contact surfaces: Steel/PTFE fabric.Phone: +86-592-580 8851 / +86-592-580 7618Email: sales@ldk-bearing.com ; benjamin@ldk-bearings.com