@julianruf those are pens, right? I think I know those... I found I prefer these over them https://www.amazon.com/Uni-ball-Signo-Um-100-Gel-Ink/dp/B00VUYJTZW/ref=pd_cart_rp_1_4?_encoding=UTF8&pd_rd_i=B00VUYJTZW&pd_rd_r=D9WH4KP8KQ6GXTZX4SJE&pd_rd_w=vGBp2&pd_rd_wg=6Lsb6&pf_rd_i=cart-page-widgets&pf_rd_m=ATVPDKIKX0DER&pf_rd_p=3426504822&pf_rd_r=D9WH4KP8KQ6GXTZX4SJE&pf_rd_s=cart-page-widgets&pf_rd_t=40701&psc=1&refRID=D9WH4KP8KQ6GXTZX4SJE