These are Indoor / Outdoor use Biker Stickers. Normally the Skull & Wrenches Evil One® Biker Stickers are $2.00, but they are now only $1 each.
These Skull & Wrenches stickers is a 3.9 inch computer-cut biker sticker / decal. So, the inside of the ring and everything besides the Skull & Wrenches is cut out. When you apply the sticker it ends up being only round part.
Finally, you might also want to check out our indoor-only Skull & Pistons Evil One® Logo Biker Stickers.