... anti-impact, light weighted, variable hardness 2)abrasive-resistant Fitness equipment accessories--seat cushion1)Polyurethane soft self-sintered skin ( ISF ) series, ... .2)Polyurethane self-sintered skin product is widely used in sports apparatus, seating mat of gymnastic appliance, backrest, kneeling pad, ... inner core is hundreds of kilos per cubic meters. Fitness equipment accessories--seat cushion