From the classic cartoon in the Kenner Retrostyle:
Teenage Mutant Ninja Turtles ReAction Action Figure Mutagen Man

Four common turtles come into contact with a mutagen in the sewer and thereby take on a human form, also a rat does. This rat named Splinter teaches the turtles Leonardo, Donatello, Michelangelo and Raphael the ninja martial arts they use against crime in the streets of New York and in the fight against their archenemy Shredder!

The classic collector's figure in the Kenner style by Super 7 is about 10 cm tall (3.75 "), movable in 5 places and comes in typical retro packaging.

Warning: Choking hazard! Small parts. Not for children under 3 years!