The appeal of NARUMI's optical glass lies in its beautiful luster and high transparency. This material, also used in precision optical instruments and single-lens reflex camera lenses, boasts a higher light transmittance and refractive index compared to ordinary glass, resulting in a clear and stunning beauty. I received this as a commemorative gift from a certain company, so the company logo is printed on the box. - Brand: GLASS WORKS NARUMI - Product Name: Loupe/Magnifying Glass - Material: Optical Glass - Shape: Spherical, Half-cylinder - Size: Spherical is approximately 8cm in diameter, Half-cylinder is approximately 16cm in length - Accessories: Instruction manual Thank you for looking.