Long Astronaut Silicon Gel Pen4 PCS Cute Astronaut Gel Pens: Material: Silicon Outer shell, Ink color: Blue, Length: Approx. 22 cm. Astronaut Tentacles design cute pens. Pen Type: Gel pen with 0. 5mm fine tip, smooth to write. Can replace the pen refills and good for your long term use. Wide Application: Great pens to sketch, draw, color, and write in a fun way. You can use it to write notebook or decoration in many ways, use your imagination. Great Gift: School educational office