Uni Pens are awesome.
https://www.amazon.com/Drawing-Assorted-Sizes-Technical-Fineliner/dp/B00F38T9C4/ref=mp_s_a_1_3?crid=28K7ACIFSB06I&keywords=uni+pen&qid=1644587712&sprefix=uni+p%2Caps%2C144&sr=8-3