These are generic dry-erase markers. They are not labeled and the colors are easy to change in any 3D computer graphic software if desired. They are the same size as a marker and can be used in a variety of settings but almost always used in conjunction with a whiteboard. If you need a whiteboard model for these markers to go along with you can get one at https://www.cgtrader.com/3d-models/furniture/other/wood-framed-whiteboard.
Made using the free carpet texture from Poliigon.com