Sakura Identi-Pen

This dual-point permanent ink marking pen gives you a fine-point tip on one end and an extra fine plastic tip on the other. Use on fabric, metal, glass, ceramics, rubber; virtually any surface. The ink is fade-proof and waterproof. It is permanent on most surfaces, but can be removed from solid, non-porous surfaces with turpentine or other thinners.

The four-pen set contains black, blue, red and green.
The eight-pen set contains black, blue, red, green, brown, purple, orange, and yellow.