Handpiece Bearing for Bien Air 1 feature of smooth ... ) 3 balls of stainless steel and ceramic Handpiece Bearing for Bien Air of high precision level P4 (ABEC 7 ... ),usable for various models of Bien-Air high-speed dental turbine handpieces. Materials of Bearing Parts: · Outer ... Refined Stainless Steel or Super-hard Ceramic Product Specifications:· Bearing dimension: d3,175*D7,938*B3,571mm· Rotating ...