Compatible with: BangersThese little spheres are designed to improve airflow, oil flow, and temperature control - all of which can help you enjoy a more consistent and enjoyable sesh.Pack Size: Two (2) PearlsSize: 4mm / 6mmMaterials:RUBY = Synthetic Lab Grown RubyQUARTZ = QuartzThis product and all products on this site are intended and sold for legal purposes only.