Pilot FriXion Ball Refill, 1.0mm, Blue-Black

This is a refill for the current Frixion Ball Knock series. 1.0mm broad tip. [Caution] Do not use on documents, addresses, or anything that must not be erased. Do not leave in direct sunlight or in high temperatures. The ink will become colorless at temperatures above 60°C. Depending on the type of paper and the characteristics of the printed material, such as thermal paper, erasing may not be possible.