Description Description GMK Mutagen has been released! A caustic love letter to all things chemical and dripping with danger. Fair warning though… From the slimy translucency, grimy black inclusions, and glow-in-the-dark pigments, this set is alarmingly contagious. Increase your toxicity with the metamorphic novelties of the Outbreak kit, keep it in check with the reversed white-accent Containment kit, or throw caution to wind and collide them into a poisonous concoction of your own making.