Platinum Double 3 Action - 2 Color 0.7 mm Ballpoint Multi Pen 0.5 mm Pencil - Black Body - Cow Leather Wrapped (MWBL3000#1) Total length 144mm  ring portion maximum diameter 14mm Eraser-100CN, Wick replacement ball-point pen BSP-100S (# 1-black, 2-red #) 0.7mm oil-based dye ink Mechanical pencil / right rotation feeding formula, knock (cap slide), the oil-based ball-point pen (black, red) / left rotation feeding formula