Dynamic's commercial grade Premium Bumper Plates have the consistent dead bounce and distinctive smooth finish that serious athletes demand. They are made with quality recycled materials, and feature a stainless steel bushing for long life and durability. These quality, yet budget-friendly plates are IWF standard 17.7" / 450mm in diameter and are perfect for executing technical lifts like the snatch, clean and jerk and dead lift. A high-performance, economical solution for any weight room or training facility, and much quieter than cast-iron plates. Will not chip floors.