Dear consuelo: I never saw your toy. But an oldtimer showed us how to make bull-roarers.Any stick about two feet long, and 1/8" thick and 1" wide, with a hole about 1/8" diameter near one end to hitch a three foot strong string to. When whirled about the head it makes a loud roaring. I have read that in some primitive cultures they were used in rituals.