Working pressure: 30kg, explosion pressure: 60kg age-resistant Made by combination of natural rubber, SBR and other special anti-aging macromolecule materialSoft and light, age-resistantWorking pressure: 30kg, explosion pressure: 60kgW0800 30M 8 50*45*45CM 33.5KGW0801 30M 10 50*45*45CM 35.5KG