I have the travel-sized version (I can't seem to locate the full size one) and it is a brush with somewhat stiff bristles that allows you to apply a pigmented line of powder eyeshadow. I have not tested it with gel eyeliners yet.
Wegreeco Bamboo Makeup Remover Pads 12 Pack with Laundry Bag - Chemical free, Reusable Soft Facial and Skin Care Wash Cloth Pads - Wipes Face Clean (3 Color)