✅It is Lure Rattles Kit with three sizes rattles: 3*16mm / 4*18mm / 5*25mm ✅ 2 or 3 steel balls create loud Chatter Sound. ✅For the best results, you can place a rattle inside some Mylar tubing, epoxy, or poppers! ✅They can be inserted into any soft plastic (No Pilot hole necessary). ✅Great for streamers,stonefly nymphs, baitfly imitations,hoppers, saltwater flies. ✅Contains metal beads, swimming can send out sound and provoke big fish. Big fish will come to attack from far away ✅Material: Glass, Steel balls. 50pcs more in a box. (Pack of 50) Glass rattle Worm Jig Fishing Lure Insert Tube Rattles Shake Attract Fly Tie Tying 3mm/4mm/5mm