... :NylonLength of safety rope:Variety Instructions for use1.Seat belts should be hung on high, in the ... new rope when the rope to add.4.Seat belt has be used after six months,according ... ,The professional testing department after passing inspection,the seat belts can continue to use,the testing the ... abnormal,Should be immediately replaced with new rope. Seat belts may not be used if there is abnormal ...