Pack of 50 precision chrome steel (G10) balls, 15 mm diameter. Designed for 15 mm bearing applications and other rolling-element uses where consistent size and durability matter. Key benefits Accurate 15 mm diameter and high roundness for smooth rolling and predictable bearing behavior Hard, wear-resistant chrome steel (G10) construction for long service life under repeated loads Consistent sizing supports even load distribution and reduces premature wear in assemblies Direct compatibility with standard 15 mm bearing setups, including housings, cages, and retainers Versatile for hobby, prototyping, and educational projects that need reliable bearing balls What these balls solve Replace inconsistent or undersized balls that cause vibration, noise, or uneven wear Provide a ready supply of standard-size balls for maintenance, repairs, and small-scale production Make prototyping faster by eliminating the need to machine or sort custom rolling elements Typical use scenarios Robotics motor rebuild: swap out worn balls in a 15 mm bearing to restore smooth motion and reduce noise RC vehicle or small machine maintenance: keep a pack on hand for quick bearing repairs or upgrades Classroom or lab demonstrations: show rolling contact, load distribution, and bearing layouts using consistent, standard-size balls Features and compatibility Quantity: 50 pieces per pack Material: Chrome steel (G10) Diameter: 15 mm Suitable for 15 mm bearing assemblies and other rolling-element applications Compatible with standard 15 mm housings, cages, and retainers This pack provides a straightforward, reliable source of standard 15 mm bearing balls for maintenance, prototyping, and practical demonstrations.