This is a guitar strap made with stretchy material. Measured at the strap holes, it was about 114mm-133mm, so I think it corresponds to size L. Instant purchase is OK. Please understand that this is a used item. -Quoted from the site- ■The original stretch strap is back The No1 Strap, a guitar strap that appeared in the early 1980s and became a sensation, is back again. No1 is a strap that optimizes the weight distribution of the instrument and provides an ultra-comfortable fit. It uses German-made stretch material to reduce the burden on the shoulders. It does not use metal or plastic parts that could damage the instrument, and uses high-quality leather for the strap ends, so it won't wobble even if the guitar is heavy. There are three sizes depending on the length: M｜L｜XXL. ■Features ・Distributes the weight of the guitar ・Reduces the burden on the shoulders ・Doesn't wobble even if the guitar is heavy ・No metal or plastic parts that could damage the instrument ・Excellent stage performance using the stretch ・Uses high-quality leather for the strap ends ・Uses German-made stretch material ・Made in USA ・The strap color is only black ■Users at the time ・Andy Summers (The Police) ・Jeff Beck ・Steve Vai ・Frank Zappa ・Matthias Jabs (Scorpions) ・Rudolf Schenker (Scorpions) ・John Kay (Steppenwolf) ・Johnny Winter ・Pete Townshend (The Who) many more…