... 4.5mm,5.0mm as requestedFeatures high-temperature sterilization in microwave ovens, and have undergone UV sterilization. ... natural fresh bamboo ,which have passed high-temperature sterilization in microwave ovens, and have undergone UV sterilization. Hygienic ... .We have factory both in Yiyang ,and Changsha , Welcome to your visits. Photos of Sample bamboo chopsticks in bulk