Upgrade your trampoline with this set of four replacement springs made of galvanized steel. These springs are perfect for both home and commercial use, and can support a maximum user weight of 220 lbs. The springs are designed to fit standard size trampolines and have a pre-tension of 15 lbs, making it easy to get started on your fitness journey. The set includes only the springs, making it easy to replace and upgrade your trampoline without any hassle. The silver color of the springs adds a touch of style to your fitness equipment. Whether you're using it for gym and training or semi-commercial use, this trampoline will provide you with a sturdy and reliable platform for your fitness activities.