3 PCS Powerful 2550 Rubber Band Replacement Kit For Catapult For King Slingshot s0159 Inside diameter:2.5mm/0.0984 inch Outside diameter:5mm/0.1968 inch Length:43cm/16.9 inch Type:Six-stripe band This mode rubber band use 5mm clips steel balls, when you buy it, please make sure your slingshot can use this mode rubber band, or you can buy the professional slingshot from our store.