Blue Permanent Makeup Carved Eyebrow Practice Skin BL-00250 is made from synthetic skin-like flexible rubber material that feels like human skin. It is good for beginners and experienced artists to practice different needles techniques on eyebrows for microblading and permanent makeup. It is the most optimal practicing material to improve your lines before you go out on the real skin. You can use it with microblading pens and permanent makeup tattoo machines.