The golds gym punch bag is designed to be struck hard mimicking body blows in real fight situations this 48in 1219cm punch bag is fitted with a heavy duty pvc coated vinyl shell with reinforced nylon seams and stitches providing extra durability the foam liner adds cushioned comfort and safety whereas the quality custom blended fill results in great stability and feel this solid bag with heavy gauge welded d and o rings can really take a beating it is supplied with chains