Made by PVC. Lightweight,stackable for easy storage. Durable platform,easy to maintain and keep clean. Provides excellent traction on any floor. Heavy-duty polypropylene material and advanced injection molding technology. Ideal for cardio workout.Perfect for indoor and outdoor use. Shock absorbing, non-stick, non-slip surface. Up to 8" of Height Adjustment, change height level easily. Specifications: Adjustable height 4" - 6" - 8". Overall platform dimensions : 31 1/4 "(L)x 12''(W)x 8"(H). Net Weight: 9.4 LBS. Weight capacity: 390 lbs. Package Included: 1 x Stepper (come with 4 risers).