ZHIGAO  ZG-5098 V16 Non Slip Coated 21.8cm Spinning Pen 1.New ZHIGAO ZG-5098 V16 Non Slip Coated 18.5cm Spinning Pen 2.Main Material: Plastic 3.Internal installation ball pen core leak proof 4.Both sides elastic soft gum, prevents the instep to fall & damage 5.The both sides firm heavy metal strengthens stably, maintains the weights & measures