pneumatic wheel, rubber material, steel rim, the max load 150kgs. 2pr & 4pr Max PSI 50-65 pneumatic wheel, rubber material, rubber percent: 15%-25%steel rim, ball bearing, the diameter:16mmthe max load 150kgs.2pr & 4prMax PSI 50-65Made in China, used for wheel barrow or handtruck and other trucks. Pneumatic wheel