They are N64 3-d magnets. It has dates of 1996 and 1997 they are marked Official Nintendo licensed product and part of a four part series including Donkey Kong, N64 star, Bowser.
On all of them they spelled bowser- bouser and they have a address from Apopka FL on the packaging. I'm guessing these were manufactured in FL since I found them not too far from Apopka. Are these official Nintendo products? I think I found one on ebay selling for $9 free shipping. I haven't been able to find pictures or info on the other characters from the set.