Shock absorber

SMA shock absorber is an oil system which has a bigger cylinder and piston rod than the shock absorber which is set up on the normal pick up. Use the special kind of piston and valve disc piston rod throughout hardening, smooth skin is durable from friction and dust stain as well, accompany with use a special grade of oil which is transparent, make to be soft and stable viscosity, strong and endurable with 2 cylinders has an iron dust excluder able to use with one ton pick up, more than 1 ton pick up, 6 wheels truck and 10 wheels truck.