I bought these Eco cups about 6 weeks ago and have been using them everyday. They are made out of bamboo and are 100% biodegradable. They have the look of melamine and are not dishwasher safe though you can use them for hot or cold drinks. I paid $20 for the 6. It will be interesting to see how they go with long term use! Part of you kind of expects them to go soft sooner or later!!! Ha!