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R144-ZZ Bearing: Both Sides Metal Shielded and pre-Lubricated with Grease, this bearing can effectively save grease,extending the life of machine. Low frictional and irregular torque ensure highly efficient power transmission and smooth rotating performance. Bearing Material: Made of chrome steel manufacturing, can deliver high performance and high load capacity. R144-ZZ Bearing Sizes: ID: 1/8 x OD: 1/4 x Width 7/64 . The high accuracy of the bearings enables excellent high-speed performance. Designed for many types of applications: Robotic, Medical equipment, 3D Printer, Align Helicopter, Trex700, Jewelry, Hand Piece, Hobby, RC Helicopters, RC Planes, RC Trucks, RC Cars, Beam Ball Bearing etc UPC 779776303164 ASIN B08M9C459Z Model R144-ZZ Bearing Brand Name Donepart Item Weight 0.35 Ounces Part Number R144-ZZ Bearing Bearing Type Ball Bearing Manufacturer Donepart Material Type Material,Metal,Steel Bearing Number R144ZZ Item Dimensions 0.25 x 1.25 x 1.09 inches Outside Diameter 0.25 Inches Specification Met ABEC 3 Compatible Lubricant Grease