This is a Kurutoga KS model mechanical pencil from uni (Mitsubishi Pencil). The lead size is 0.3mm. I bought it but don't remember ever using it (I've listed the product condition as "Like New"). I'm also including a 0.3mm lead refill from uni. The lead hardness is HB. It's not unopened; I've taken some out and put them in the Kurutoga pencil, so please refer to the images for the remaining amount.