The tube forms the structural core of the finished rollerball pen, providing the strength, stability, and precise alignment required for smooth assembly and reliable writing performance. Manufactured to match the original Ink Rollerball Pen Kit specifications, this replacement tube ensures accurate hardware fitment and helps maintain the professional appearance of your handcrafted writing instrument.

Whether you’re turning timber, acrylic, resin, or hybrid pen blanks, this replacement tube is an essential workshop spare that helps minimise waste and protect valuable materials.