These spring covers are suitable for your trampoline:

Pad for Basic set 396 cm trampoline
On the way
Separate protective spring cover for 396 cm trampoline, UV protection, prevents … Buy
Protective Spring Cover inSPORTline Sun 396 cm
86 € (10%) 77,40 
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Protective spring cover for trampolines, quick and easy set-up, prevents injuries. Buy