size:21 yards are 13.5cm long, 22 yards are 14cm long, 23 yards are 14.5cm long, 24 yards are 15cm long, 25 yards are 15.5cm long, 26 yards are 16cm long, 27 yards are 16.5cm long, 28 yards are 17cm long, 29 yards are 17.5cm long, 30 yards are 18cm long, 31 yards are 18.5cm long, 32 yards are 19cm long
