NIKE AIR MAX SYSTM. These are authentic, purchased from a retail store, so please buy with confidence. The size is 27.5cm. The condition is new and unused. I am selling them because the size didn't fit. Please refrain from purchasing if you are looking for a perfect new item or if you are nervous about home storage. This is a personal sale, so no claims or returns are accepted. Size: 27.5cm Target: Adults