Muji Clear Ballpoint Gel Pen 0.5mm [16 colors SET] 16 colors: Black, gray, blue-black, blue, light blue, purple, red purple, red, sakura(cherry blossoms), pink, Asagi(pale-green blue), orange, yellow, yellow-green, green, brown Smooth Writing Gel Ink Pens 0.5mm. The Ink and mechanism have been designed to give an even smoother writing action, than the current gel ink pens. Water based pigment. The body are made of recycled materials. Made in Japan.