Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Chemical smell makes them unusable.

They arrived promptly and the guild quality is what you would expect for the price. After wearing them for a while I noticed a smell which I can only describe as skunk like. I though it was a wildlife visitor but no. The smell comes from the plastic used for the nose pads. The smell makes me ill ,(head ache and nausea), so I will file these in the trash . I have tested the cause and effect several times with the same results. Cheap products being made in China make me wary.Maybe others aren't sensitive to the chemical smell but be aware.