50/100 Worm Jig Fishing Lure Plastic Rattles Insert Tube Rattles Shake Attract Fly Tie Tying THE RATTLES ARE MADE OF PLASTIC SHELL AND STAINLESS STELL BALLSS, NOT THE GLASS RATTLES. 3mm  16 mm - small size flies ( sz 14 to 16) They are as loud as the glass rattles, but stronger and solid. 2 steel balls create loud Chatter Sound. NOT EASY TO BREAK. LAST LONGER.