• High quality materials with a precise tolerance
• Mixture of silicon and grease lubricants
• Package contains 16 bearings
• Sealed Bearings to Keep Elements Out – Not Serviceable

SG9 Bearings. SG stands for silicone grease. The silicone grease protects bearings from the elements and allows the wheels to spin fast while keeping them well lubed. Includes 16 bearings.