These clever feeders carry the name No/No because their all-metal design incorporates “No” wood and “No” plastic.  They are for use with Black Oil Sunflower Seeds to feed clinging birds such as Nuthatch and Finch.  They collapse flat for easy shipping and storage, and they are dishwasher safe for easy cleaning.  Rain and snow blow right through.  Holds 2 1/2 Pounds of seed.