Bumper plates are crafted from Nike Grind rubber, a byproduct of Nike's footwear manufacturing process. Measured by total product volume, each plate is made with at least 30% Nike Grind rubber. Because footwear color palettes vary from season to season, each batch of Nike Grind rubber is unique and yields a limited edition run of these plates as they're released. These versatile plates will become your go-to for Olympic lifts, powerlifting, bodybuilding, and functional training. Get grinding rep after rep! JUST DO IT. Each batch is unique - your plates may differ slightly from the images shown. FEATURES & SPECS Nike Grind Measured by total product volume, each plate is made with at least 30% Nike Grind, a recycled material made from Nike's footwear manufacturing process Versatile Perfect for use in a wide variety of weightlifting exercises, including Olympic weightlifting, powerlifting, bodybuilding, and general fitness Rigorous Testing Drop tested 10,000 times to meet strict durability standards so plates can withstand repeated drops* Specs Fits All Standard 50mm Barbell Sleeves Thickness: 42mm to 80mm depending on weight Diameter: 450 mm (10 kg to 20 kg), 359mm (5 kg) Weight Precision: +/- 1% Bounce: Moderate, durometer of 65 +/-3 Please Note: The Nike Grind Bumper Plates may yellow over time as they are exposed to ultraviolet rays such as sunlight or heat. This natural process will not affect the integrity or function of the plate. *5 kg plates are not to be dropped alone. Must be paired with 10 kg plates or above.