The Reeplex Pro Competition bumper plates are designed to meet the highest standards. They have a 450mm diameter (following the IWF Standard) and a sturdy chrome-plated center steel disk that can handle the impact when you drop a fully loaded barbell. These Pro bumper plates have been tested by dropping them 50,000 times, proving their exceptional strength and durability for even the most challenging workouts. 15kg Reeplex Pro Competition Bumper Plates Pair****Features- 2 x 15kg Reeplex Pro Competition Bumper Plates 450mm Diameter ( IWF Standard ) Plate Thickness: 43mm Chrome Steel centre disk Centre hole diameter: 50mm High-tensile Allen bolts Drop tested to: 50,000 times