Ping i5 Irons. The i5 iron is a mid-size, stainless steel iron with reduced offset. The perimeter weighted iron shares many of the G5 iron features, including the larger, thinner Custom Tuning Port (CTP) for improved feel. The sole width and cavity size are created for forgiveness and playability. The lead edge and bounce angle are designed for a smoother, forgiving transition through the turf and from the rough.