Mini ink converter - Increases ink absorption length, avoiding direct contact with the ink bottle and reducing the risk of damage to your pen. Fountain pen ink converter - Simple, practical design that is easy to use and provides convenient filling for refillable fountain pens. Fountain pen ink filler - Includes 5 pieces, enough for multiple uses; a reliable fountain pen tool for everyday ink refilling. Universal fountain pen ink converter - Ergonomic design, easy to install and use; compatible with most fountain pens and calligraphy pens. Set contains 5 pieces for immediate use across several pens. Use scenarios - Home or desk filling: refill your fountain pen from bottled ink without removing the nib from the pen. - Travel ready: carry the 5-piece set to refill multiple pens on the go without carrying ink bottles. - Calligraphy practice: use with calligraphy pens to supply ink from bottles efficiently and cleanly.