Being the fastest growing plant in the world and wholly self-regenerating, bamboo has a low impact to the environment and is easily renewable and completely biodegradable. It's simply great. Making a conscious decision towards a green planet is easier than ever before. Disclaimer: Please be advised that while the Gusto Cup is durable, accidents may cause a chip or crack and it is not suitable for oven or microwave use as well as liquids at boiling temperature (100°C/212° F). Dishwasher safe. Material Information: bamboo fiber, a highly renewable material, and 100% non-toxic food-grade A5 melamine binder. The food-grade melamine binder is 100% non-toxic and food safe. This product complies with the European Plastic regulation (EU) N10/2011 and Regulation (EC) No. 1935/2004 which acknowledges that our dishware is suitable for all types of food and liquid below boiling temperature. The only condition where migration of the resin binder may occur is if it is heated to temperatures above boiling (100°C/212° F) for an excessive period of time (90 minutes +). Heating under extreme temperatures essentially melts the material, changing its molecular structure - for this reason, we do not recommend microwave and conventional oven use."