These are made of heavy-duty cast iron with a machined stainless steel hub for a long-lasting, dependable weight that can withstand even the most strenuous workouts. To prevent damage to the floor, this Meerut Gym and Gymnastic works product is coated with thick rubber. Fits all traditional Olympic bars and racks with a 2-inch hole; can be used for muscle building and stability training, as well as increasing flexibility and balance. Single weight plate of these Rubber Coated Black Coloured Weight Plates, is also great for warming up. It is very convenient and comfortable to use this Marino product. When loading and unloading the weights, each plate have three openings with strips on them for a stable grip. For quick identification, the labels have been labelled in LB.