These are lightweight bottle cage mounting bolts made of aluminum by KCNC. This listing is for two sets of 2 bolts each, for a total of 4 bolts. Washers are included. The regular price seems to be 1,650 yen for a pair of 2 bolts. They are new and unused. They come with a backing card. They will be shipped via mini-letter without the transparent resin packaging, along with the backing card. ■ Material: 7075 Aluminum Alloy ■ Size: M5 x 15mm ■ Approximate Weight: 2.5g (per bolt)