... high anti-impact, light weighted, variable hardness 2)abrasive-resistant Fitness equipment accessories--seat cushion1)Polyurethane soft self-sintered skin ( ISF ) ... appliance, backrest, kneeling pad, handle, footboard, bike saddle, sport protective rings. It is also extensively used medical appliance, such ... core is hundreds of kilos per cubic meters. Fitness equipment accessories--seat cushion