Metalic Marker Pen --12.0 mm (cap dia.) x 12.4mm (barrel dia.) x 141 mm (long), tip- nylone metallic soft tip /size 3.8mm(D1)*7.5mm(L1)-3.55mm(D2)*29.5mm(L2), ink - water-based / 1.8g-2.0g / 80m writing-length, Shelf-life 2 years at least.