I have tried many brands of colored pencils over the years for adult coloring books. Hands down, these are the best I have tried. They put down color easily, keep their point, and sharpen without eating up the pencil. Plenty of colors and the color names are on the pencil for easy identification. Highly recommended.
Colored Pencils for Adults Coloring Books Drawing Pencils Artist Set with Paintbrush
(Pack of 48) https://www.amazon.com/dp/B072WQRXSP/ref=cm_sw_r_cp_api_VEnBBbT6AW54Z