Uni MITSUBISHI PENCIL Posca Ultra-Thin 8-Color Water Marker SetMaterial: Shaft material: PP resin; Case material: paper Sizes: 0. 7 mm, 1. 8 2. 5 mm, 8 mm, 15 mm This set includes 8 colors: red, blue, green, yellow, white, black, gold, and silver, allowing for various applications. To use, simply choose the appropriate pen tip for the material you're using and draw on the desired area. However, be cautious as the ink may bleed or peel off when exposed to water or subjected to strong friction.