TyreBeads Motorcycle Tire Balancing Bead Kit (XL) - Front (2 Oz) and Back (3 Oz) Tire Beads Includes 2 oz for front tire, 3 oz for back tire, a valve core tool, and an applicator tube These are premium internal tire ceramic balancing beads. Reusable, super hard, durable, and eco-friendly - will not rust, clump, or melt These work with tube type tires. The application photos are representative since the same install process applies for all kits. THESE ARE NOT GLASS, which is a softer material that has a tendency to break down into powder, which will clump and is a health hazard.