Features:_x000D__x000D_With polished smooth surface, it works well with high efficiency causing low noise. _x000D_High temperature resistance, able to operate at a temperature range of -20-200 or so. _x000D_Adopting premium bearing steel material, solid enough for a long term use. _x000D_Wide applications in many fields: industrial machines, cars, ships, household appliances, health care system, etc._x000D__x000D_2 Rubber seals protect it against water and dust or any other objects invasion. _x000D_With 10 pcs in package, you can keep them for spare, very practical in our daily life. _x000D__x000D_Specification:_x000D__x000D_Material: Bearing Steel _x000D_Type: 6001-2RS _x000D_Color:Silver(Shown as pictures)_x000D_Inner Dia: Approx. 12mm/0.47inch_x000D_Outer Dia: Approx. 28mm/1.10inch_x000D_Thickness: Approx. 8mm/0.31inch_x000D_Application Temperature: -20-200_x000D_Quantity: 10 Pcs_x000D_Weight: Approx. 195g_x000D__x000D_Packing List:_x000D_1 x 10 Pcs Ball Bearings 1With polished smooth surface, it works well with high efficiency causing low noise. 2High temperature resistance, able to operate at a temperature range of -20-200 or so. 3Adopting premium bearing steel material, solid enough for a long term use. 4Wide applications in many fields: industrial machines, cars, ships, household appliances, health care system, etc. 52 Rubber seals protect it against water and dust or any other objects invasion.