Pair of contact poi comes in two sizes 80mm 90mm and 100mm, with the ball weight of 150gm. Contact poi represents the latest innovation in poi swinging, being perfect for isolations, throws and body rolling. The weighted silicon knob (diameter 40 mm) used in this poi version has a great grip and is a perfect counterweight on throws. The string has a 6mm diameter and is 50 cm long. To adjust the length of the string just pull it out off the knob, tie a simple knot and cut the excess.