Lunch box high quality SS 18/8 double wall stainless steel,high vacuum effect. BPA free,eco friendly Lunch box350/500mlhigh quality SS 18/8Shipping ... will cause deformation and damage * Against any way of derectly heating. * When cleaning, do not use alkaline bleaching agent, metal, chemical ... not high-temperature sterilization, to avoid deformation.Other food container: Stainless steel lunch box