This is a classic Mylar Balloon. It was likely found at party shops in the mid 1990s. It has 'getting ready to run' Sonic as a large graphic, and then stock arts for Robotnick, Knuckles Tails & even Sally around the edge, with colored checkers. There's a 'speed streak' running with dust puffs behind all the characters. It is the only known classic mylar balloon, and it is likely to be rare.