Semi Permanent Makeup Practice Skins are thick enough to be used on both sides, recommended for beginner Brow artists. The practice skin is used to get comfortable microblading , micropigmentation or scalp pigmentation. Also used by tattoo artists.
Keep in mind nothing comes close to real human skin. These are used to get comfortable holding a tattoo machine or Ecuri hand held microblading tool. Do not practice on yourself or people without proper training by a professional tattoo artists or Ecuri Trainers.