Description Made of high-quality plastic material. A simple plunger driven ink container refills easily to use liquid ink neatly and conveniently with your fountain pen. Liquid ink is smooth flowing, leaves a solid, confident line, and adds to the sophisticated experience of fountain pen use. Features -Material:Plastic -Size:5.00X0.60X0.60cm/1.97X0.24X0.24in -Built with strong and durable material to withstand continuous use. -It has a simple design, but very practical in use, to bring much convenience to you. -Not easy to deform, it's convenient and durable. -The product design conforms to the ergonomic design, easy to install and use. -From the overall design and finish exquisite workmanship would be seen. Package listing: 1 x Set of 50pcs Pen Ink Sacs