While most solid rubber plates just don"t last, the Troy Barbell Solid Olympic Interlocking Rubber Bumper Plate is built tough for tough workouts. The interlocking design has a stainless steel insert, and each bumper plate is sold separately in your choice of weight. Dimensions10-pound: 9.13 diam. inches 25-pound: 11 diam. inches 35-pound: 14.5 diam. inches 45-pound: 17.75 diam. inches About Troy Barbell: Since 1987, Troy Barbell has been developing and manufacturing free weights and fitness equipment while providing unparalleled quality, service, and satisfaction to its growing customer base. Today, the Houston-based company is one of the top free-weight manufacturers in the industry with a diverse range of products and a full commitment to use only the highest grade materials and designs. The Troy family consists of three lines: USA, leading-quality home fitness; VTX, committed to specialty and training applications; and Troy, the premium line of free-weight equipment for commercial and institutional use. Made of solid rubber - no steel core. Heavy-duty bumper plate with interlocking design. Stainless steel insert. Sold individually in variety of weights. 5-year manufacturer"s warranty.