Bullet Points: 1Heavy Duty Galvanized Spring: The springs feature the heat treated premium galvanized steel, and they are made for years of jumping fun. 2Bounce Improving: The trampoline springs are designed to give it that great bounce! 3Crack-resistant Design: The spring is crack-resistant, and these springs are designed with an advanced tension mechanism with a new tapered design for greater jumping experience. 4Easy to Use: Use a t-hook for best performance to install springs, and the hook is curved at an angle that provides the greatest hold. Jump and bounce without the fear of the springs coming off. 5Perfect Trampoline Accessory: These upgraded trampoline springs are designed to replace your trampoline's worn out and dangerous springs and return bounce to your trampoline. Features: 1.Designedforbringinggreatbouncetoyourtrampoline. 2.Slightlycurvedshape,moredurableandhighertensilestrengththanthoseshapedstraight. 3.Perfectreplacementtorusted,wornoutanddangerousspringsoftrampoline. 4.Coldweathercrack-resistant,weatherresistantandanti-rust. 5.Hooksforfirmhold,nofearaboutspringscomingoffwhenjumping. 6.(about)11.6CM/4.57in,14CM/5.51in,16.5CM/6.50in,17.8CM/7.01in,21CM/8.27inTrampolinespringslightlycurvedshape,moredurableandhighertensilestrengththanthoseshapedstraight.Hooksforfirmhold,nofearaboutspringscomingoffwhenjumping. 7.Pleasenotethat(about)8.8CM/3.46inisastraightcylinderspring,suitableforsmalltrampoline,(about)11.6CM/4.57in,14CM/5.51in,16.5CM/6.50in,17.8CM/7.01in,21CM/8.27iniswaistdrumspring,suitableforlargetrampoline. 8.UsedwithT-hook(NotIncluded)foreasyinstallation. Specifications: Name:10PCSChildrenTrampolineTensionSpring Material:galvanizedsteel Standards(about): Straightspringlength:8.8CM/3.46in,suitableforsmalltrampoline Waistdrumspringlength:11.6CM/4.57in,14CM/5.51in,16.5CM/6.50in,17.8CM/7.01in,21CM/8.27in,suitableforlargetrampoline Triangularbuckle:(sendblackribbon) Springhook:Pullspringtool PackingList: Spring*10(optional) TriangularBuckle*10(optional) SpringHook*1(optional) _x000D_ _x000D_