Model big air 12ft safety enclosure brief description the big air 12ft safety enclosure has been enhanced for this season to give improved all round durability the trampoline is not included with this item this item is the standalone enclosure only the big air enclosure is a free standing safety net that secures to the legs of the trampoline with specially adapted galvanised steel clamps the safety net is manufactured from 16 gauge hot galvanised steel better for garden and outdoor use