For Zebra Clip-on Multi B4sa Series-0.7mm Black, Blue, Red ,Green Ink Each 1refills & Uni Diamond Infused High Quality Leads [Nano Dia-40 Leads] 0.5mm Hb Value Set (With Values Japan Original Discription of Goods) It is a set of the spare Refills &Leads made specially for those who own All the Clip-on multi B4SA Series It is smooth and they are a spare lead which cannot break easily, and the profitable set which attached Nano Daia (hot product of Uni) together.(HB 40 Leads)