This is a 0.38mm Frixion ballpoint pen refill. Set of 3 red refills 4 orange refills Size: 0.38mm Please comment if you have any questions. I will add photos. ★Please purchase only if you understand that these are used items stored at home. If you are concerned about small details or are nervous, please refrain from purchasing. ★We do not offer individual sales, price negotiations, or returns. Please refrain from such requests (＞人＜;). ★Please also check my profile.