The structure of the trampoline was smooth and it works well. Compared to the product description on the trampoline with 310 cm in diameter, however, is the jumping mat higher and above all, it has instead of the specified 64 steel springs only 60 pieces. The trampoline was a substitute for purchasing a trampoline with the same diameter, but others make, which was 20 more expensive than the Kinetic Sports. Compared to our previous trampoline springs this trampoline of Kinetic Sports are much shorter and thinner. The jumps on this trampoline cost significantly more power and miss the previous heights considerably. My kids are very disappointed. Given the weak springs, I am very skeptical about whether they are made to last (if it should be used as frequently as our old trampoline in spite of its weaknesses).