Sewing Supplies:
Rattle

Plastic soft sided Rattle fit for any toys. 

These are excellent tucked inside the Knit Floppy Bear in particular, but I've used them for all sorts of toys. It has an excellent rattle tone, which is loud enough to be heard even when tucked inside a soft toy but not too tinny. Soft edges and wholly enclosed rattle make it suitable for any soft toys and washable.