Color: Anthracite. The Sport-Thieme Balance Cushion Gymfit 33 with nubs supports proper body posture. This cushion helps relieve your upper body and promotes sitting up straight, as the instability of the cushion requires you to maintain your center of gravity. It improves the core, back, and the head and neck vertebrae. The nubs on the surface also promote blood circulation and allow for better air circulation. With improved circulation, it doesn't get as warm when sitting, and it provides a pleasant massage effect. The difficulty level of balancing can be adjusted by changing the air pressure via the needle valve. Maximum load capacity: 150 kg. Diameter: 33 cm. Material: PVC. Filling: Air. Dimensions: ø 33 cm. Application areas: Abdomen, neck, back, spine, buttocks. Target group: Adults. Weight: 1.0 kg.