1pc 4 Inch Diameter Hardened Chrome Solid Steel Bearing Balls(101.6mm) Including:1PC 4 inches (101.6mm) chrome steel precision bearing ball Material: High precision chrome steel, AISI 52100 chrome steel which is a common material for bearing balls.High strength ,medium corrosion resistance, good hardness, and wear resistance. Capability: high hardness, high load capacity, wear resistant, offering a long operating life,Wide range of applications. Application: Maintain product that uses steel balls like ball bearings, turntable, drawer slides, casters, door locks.DIY projects like decoration, desk toy, monkey's fist, fitness, adding weight for projects, professional usage like load cell, ect Surface: Mirror polished, appealing shiny finish，Smooth surface give you comfortable touch. UPC 735749700866 ASIN B0DYNRZVJT Model 4 inch 1pc Brand Name Breezliy Part Number 1pc 4 Chorme Balls. Bearing Type Ball Bearing Manufacturer Breezliy Material Type Alloy Steel Item Thickness 10.16 Centimeters Item Dimensions 4 x 4 x 4 inches Outside Diameter 4 Inches Specification Met ISO 9001 Included Components 1pc 4 Chorme Balls. Compatible Lubricant Grease