These reliable gas shocks incorporate a strong annealed steel rod with a special coating for added corrosion resistance. These shocks are an ideal choice when used near or around high salt water areas where corrosion is a large factor. All shocks fit 10 mm ball ends unless noted. The P1 force is the lbs of force exerted when the gas springs is in the fully open or exteneded postion. | Camping World Gas Shock 10 mm ball end 20" x 50 lbs