Mechanism: Knock-type Ball diameter: 0.5mm (extra fine) Ink: Acro Ink (low-viscosity oil-based ink) Ink color: Black Size: Total length 143mm, maximum diameter 10.1mm The "Acro ANNA SUI Collaboration Silver Line" features a glamorous design suitable for everyday use, with the "ANNA SUI" logo and popular motifs like cats, as well as cherry, flower, and bouquet motifs from original prints that appeared in past collections, all applied to metal parts in a standard silver color. The ink color is all black, and the ball diameter is an extra-fine 0.5mm, perfect for use in planners and memos, making it suitable for various situations. Cherry and bouquet patterns. I received it as a gift, but I haven't used it and have kept it in storage. There is no box.