Ltpgtltstronggtput safety first with 66fit safety resistance tubesltstronggtltpgtr ltpgt66fit safety exercise tubes allow you to carry out some serious exercise whilst maintaining peace of mindltpgtr ltpgtour brand new safety workout tubes are constructed from tpr thermoplastic rubber with a soft nylon outer sleeve covering the entire 16m length of tube to protect the user in the unlikely event of the tube breaking or snapping during useltpgtr ltpgtu