Cap"s 300 Lb. 2" Olympic Weight Set is made of solid cast iron. This set includes a 7" olympic bar, 2 spring clip collars, and black finish. The perfect weight set for advanced weight training exercises. Warning: This product contains one or more phthalate chemicals known to the state of California to cause birth defects and other reproductive harm. Consumer may return the product for a full refund, including shipping cost for both receipt and return of the product within 15 days of his or her receipt.