Tamiya Craft Cotton Swabs (Round, Small, 50PCS)

From the manufacturer:

These are industrial strength cotton swabs, and compared with those found in supermarkets, they do not fray as easily when wet or dipped in solvents, resulting in less wastage.

• These swabs are great for applying decals and panel lining onto model surfaces.
• Creating fine details and weathering on small areas becomes a breeze.
• You can also use the swabs effectively for applying any of the Weathering Master Set color schemes, such as realistic rust stains, to your model.