Made of heavy-duty cast iron with a machined stainless steel hub to ensure a durable, reliable weight that will last through grueling workouts. Coated with dense rubber to alleviate damage to floor. Can be used to perform muscle strengthening exercises and endurance training, and to increase flexibility and balance, single weight plate is also great for warm up.Each plate has 3 openings with strips on them for easy and secure grip when loading and unloading the weights.2.5+5+10+15+20+25kg 50mm large central hole plate