Signup ends on 4/10 (its a shotgun drawing).
Here's a picture of the set and some specifications.

John's spinner weighs .19oz and is 3 inches long
Corey's spinner weighs .30oz and is 4.5 inches long
Mike's spinner weighs .16oz and is 3.5 inches long
Toni's spinner weighs .22oz and is 3 inches long
I'll assign numbers to each participant and then do a random number generator drawing to pick the winner.