The Ink Barrel draws its inspiration from oxygen tanks used in space and energy barrels from sci-fi films. Crafted from stainless steel, it features a subtle curve along the side edges for a stable grip. The cap includes a groove that serves as a resting place for the Nib Holder, preventing it from rolling away during use. In addition, it holds approximately 3.5ml of ink, providing a convenient size for easy handling while ensuring sufficient storage capacity. The pen rest is designed to perfectly fit the Shuttle Nib Holder but is also compatible with standard nib holders without any issues. Please note: Exercise caution when using it with products that are sensitive to scratches. Material: Stainless Steel Size: 19.5mm x 30.5mm Weight: 44g