Constructed of extra-thick premium grade genuine cow hide leather outer shell with premium grade canvas full-length supportive inner lining. Quadruple stitching and stainless steel rivets in all stress areas with doubled-over extra-thick premium grade genuine cow hide leather hanging loops for ultimate longevity. Built to withstand the daily punishment in Bangkok's top gyms. The ultimate full leather heavy bag for Muay Thai or boxing.As used by David "The Haymaker" Haye in his personal gym. Punchbag weight: 4ft = 45kg / 5ft = 50kg / 5.6ft = 55kg.