Made in Japan by Seiko Seisakusho Co., Ltd. Item No. OPF / OPM Type: F (Fine size) / M (Medium size) Suitable for overhead projectors, writing on plastic, metal, glass, ceramic, paper, CD / DVD, clothes, wood, etc. For Smooth Surfaces Available colours: Black , Red , Blue , Green Ink type: Water-based ink Line width: FINE (0.5 mm) / MEDIUM (1.0 mm)