This 6-Tier Rack is made from steel with a black powder coat and rubber inserts on the feet to close off the steel edges. Each dumbbell cradle features rubber inserts to prevent scratches on the dumbbell handles. The durable, versatile dumbbells are made from ASTM A48 Class 20 grey iron joined together by a solid 1018 cold rolled steel chrome handle.* Rack base measures 23.8" x 19.9" and is 38.2" tall* Noise-reducing PVC is perfect for home use and safe for all flooring. Our favorite feature? No bad rubber smell! The hex shape prevents rolling and provides stability for floor exercises. The unique ergo handle provides surface area for a firm grip. This set is perfect for targeted muscle work or a full body workout.