Features: Good Elasticity Strong Stretch Ability It is designed with a waist drum for bringing great bounce to your trampoline(wider diameter for more bounce), has better elasticity and stretching ability than those shaped straight, which will give you a better jumping experience. Increased Hook Curvature for Maximum Hold One end of the hook is curved at an angle that provides the superior hold. So, they are extremely safe. You can jump and bounce without the fear of the springs coming off. High Tensile and Durable The springs themselves are made of high-quality metal, anti-rust, unbreakable, crack-resistant, excellent resilience and durability. Unique T-hook Spring Pull ToolOur spring pulling tool is made good metal material, much more sturdy and comfortable to use, wont hurt your hand, makes assembling a trampoline much easier. Satisfaction GuaranteedIf you have any questions, please feel free to contact us.We care deeply for our customers and make you our top priority Thank you Package Includes: 1 x T-Hook 10 x Trampoline Spring Specifications: Material: Metal Weight: 1200g Trampoline Spring Size: 14cm/5.51in T-Hook Size: 15.2x10.5 cm/5.89x4.13 in Color: As the Picture Shows note: Please allow 1-2cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you