These mini inkwells allow you to see your nib as you dip into the ink, allowing you to easily control the depth. They are especially well-suited for pointed pen. Each has four plastic vials, four screw-tops, and an unfinished wooden base. The screw-tops seal the vials tight for transporting or storage (you should keep the filled vials upright). Vial inside dimensions: approximately 14mm dia. x 20mm high.