Bamboo cups are made of 100% natural, biodegradable bamboo. Bamboo cups do not use chemicals, safe for users. Light bamboo cup, easy to carry, don't worry about breaking. Bamboo cups are treated to remove carbon and sugar by boiling in salt water & drying, so it completely destroys termite larvae. Product is also a great tool to educate & remind children about a "green - clean" lifestyle, respecting nature, and protecting the environment. Sponge made from bamboo also has feng shui / spiritual meaning in the life of Vietnamese people when bamboo is considered to bring health, love, fortune, prosperity and luck to the owner. Easily personalize products by laser engraving logos, images, slogans...