Bowser Stickers (also known as Bowser Tape) are items found in Paper Mario: Sticker Star.
Bowser Stickers are mainly yellow in color with black lines all over it. It also has Bowser's main symbol on it and the words "BOWSER" written right in the middle of it.
Bowser Stickers are used mainly to trap Toads and block certain passageways (especially those that lead to secret rooms) to halt Mario's progress. Bowser Stickers can be easily peeled off and they disappear soon after. Bowser Stickers are found nearly in every level in Paper Mario: Sticker Star and Paper Mario: Color Splash.