Noodler's Polar Blue Eel Ink contains lubrication to help keep ink flowing smoothly in any fountain pen. Polar Blue is permanent "bullet-proof" ink and is freeze-resistant even in very cold climates. Safe for fountain pens of all types, this pH neutral ink provides archival quality. 100% made in the USA. Includes eye-dropper fill fountain pen. Size: 4.5 oz bottle with eyedropper. 19805.(Color samples are approximate. Use this sample as a general reference only.)