Although Uniball don’t have a wide range of mechanical pencils they do have something a little different in the Shalaku which has a clickable button on the side to advance the lead.
The Uni Shalaku M5-228 Mechanical Pencil is available in 3 colours, it has a 0.5mm Nano Dia lead & an eraser. The lead contains carbon based nano particles that Uni call “nano-diamonds” this gives it strength & enables smooth writing.