This is a practice item from Kashiwai High School in Chiba Prefecture, a prestigious public school known for its long-standing volleyball dominance in the highly competitive Chiba area. They have produced players for the Japanese national team and V.League players. Size is approximately women's M-L. The size markings vary, but they appear to fit someone around 165-170cm tall. There don't seem to be any flaws that would affect use, but please forgive any oversights. It can be used normally after washing.