It is a refill dedicated to TRC ballpoint pen.
When exchanging the refill, turn the pen tip and remove the finished refill. Please insert a new refill and close the pen tip.
MADE IN JAPAN
ABOUT BRASS PRODUCTS
BRASS changes its color and texture as you use it, and every single BRASS item changes differently depending on the user and his/her environment. This is something unique to and wonderful about brass. As the copper within the brass oxidizes, your brass item might develop some verdigris, a kind of rust. Take it easy, since it does no harm to you. If you want the original gloss of the brass back, just try polishing the item with metal polish. Enjoy and cherish the highly nuanced color hue and texture only brass can give you.