"? Body Sculpture Core Slider Discs ? With use can help strengthen your abdominal and core muscle groups ? Improves your stability, flexibility and endurance ? Use for a variety of workout routines, including yoga, Pilates, aerobics, conditioning and more ? As your hands or feet do not leave the floor, the core slider discs allow you to glide into lunges, planks, hamstring curls and push ups without putting strain on your joints and tendons. ? Low impact on muscles and joints ? Glides on any surface- use the smooth side for carpets and the fabric for smooth floors and laminates ? Materials: Smooth side is made from environmentally friendly pressure proof ABS engineered plastic & the cloth is non slip, natural fibre EVA ? Lightweight & portable ? Diameter- 17.5cm (7?)"