Wired stopper nuts are another classic gear set. It consists of 7 pieces of stopper nuts, meeting most common placements sizes. There are not many trad climbers who have never used this kind of gear. It is ideal in cracks, mainly in vertical ones. Swaged wire is very stiff, enabling easy placement and retrieval. Swaged wire loops are color coded for easy identification and sizing. Made of extra durable aluminum alloy AlSi10Mg.