Dual shock-absorbing springs sit behind the mounting plate on this 18-inch ring, so the rim gives a little on hard contact instead of transferring every shot straight into the wall. Tube stock measures 0.63 inch, roughly 16 millimetres, and pairs with a thickened metal backing plate across a 23.5-by-19-by-4.33-inch footprint. The standard 18-inch inner diameter and 19-inch outer ring drop straight onto existing stands, doors or masonry walls as a replacement. A weather-resistant, anti-tear net hangs from formed hooks that resist bending after seasons outdoors. Four pounds of hardware, a full accessories kit and printed instructions arrive together, so the swap takes an afternoon rather than a weekend. Assembly covers bolting the plate down and hanging the net, and the same ring fits an indoor gym wall or an outdoor pole. Powder coating over the metal tube is what keeps the finish intact through wet weather on an exposed wall.