These gravity feed pocket-sized markers are filled with fast-drying oil based ink that is UV and water resistant. Magic Ink was developed in Japan, and has been sold since 1953. Features a glass body and 1mm x 5mm x 8mm felt tip chisel nib. Works well on a variety of surfaces including: glass, paper, metal, plastic, leather, wood, ceramic and even ice! We Highly recommend you use these on stickers. Winner of 2008 Good Design Japan Award. Refillable and replaceable nib. For professional use. Keep out of reach from children.