BERG Elite The protective edge is made of extremely high-quality material, as much as 40 cm wide and 30 mm thick! The frame of the BERG Elite is galvanised on the inside and out to make it rustproof. The springs are attached to the jumping mat by triangular hooks and secured by a full 8 rows of stitching. Available in red or green. Goldspring BERG Toys has developed a unique spring, the goldspring. It enables jumping energy to be built up gradually so that the forces on the body are gentler. This means you can jump higher, more comfortably and more safely. Also suitable for professional use.