The Samambu pen set features a unique pen with two tips: 1 ballpoint pen and 1 inkless pen. The inkless part does not require ink cartridges or refills. The pen's black graphite tip is designed to leave visible traces on the writing surface. Choosing an inkless bamboo pen promotes more sustainable practices and encourages the use of renewable materials. The ballpoint pen features black ink, a 1.00 mm nib and a writing capacity of 600 meters. Inkless pen writing capacity: 1500 meters.