Made from high-quality 18/10 stainless steel. BPA-free. Double-walled insulation, does not transmit heat or cold. Duration: cold drinks up to 24 hours / hot drinks up to 12 hours. Wooden stopper with a ring for hanging. Leak-proof and spill-proof screw cap. Does not transmit flavors or odors. Not dishwasher safe. - Made from stainless steel (interior 18/10). - Double-walled insulation, does not transmit heat or cold. - Hermetic, spill-proof lid. - Does not transmit flavors or odors. - BPA-free.