There are two English letters written on the back of the lenses. sr = Skin Rejuvenation Lens : For collagen production and getting rid of melasma, wrinkles, dark spots, and skin lightening. ac = Acne Control Lens : For removing acne under and outside the skin and closing pores. hr = Hair Removal Lens (used for all body areas: face, mustache, hands, legs, armpits) And unlimited flashes (Personal use) Location: Riyadh Al-Khobar