Wizzzer was basically a two-tone, plastic gyroscope. My sister's was purple and green I think.
On one end it had a small rubber cone which you "whizzed" along the floor to power it up like a friction motor; then let it go. On the other end was a hole for different attachments. For example you could put a slotted piece of plastic in and make the wizzzer walk along a piece of string!
Do You Remember Wizzzer?
Do You Remember Wizzzer?