This is a multi-function pen purchased at the Bananaman Sekkaku Gourmet Exhibition. It's a 4-color ballpoint pen & mechanical pencil. ● Size (approx.) / Shaft diameter 13.7 x thickness 18.5 x total length 148.8mm ● Materials / Brass, rubber, ABS resin, steel ● Made in Japan I bought this for myself, but I didn't end up using it, so I'm putting it up for sale. Please check my profile. Jetstream