This kind of bottle, made of food grade 18/8 (type 304) stainless steel both inside and inside walls. Eco-friendly, non-toxic, shockproof and shatter proof, scratching resistance. Double wall vacuum insulated technology design make it keep hot up to 12 hours, keep cold up to 24 hours. Features screw on, spill resistant lid and wide mouth opening. Great for outdoor events. Imprint it with your logo and show that you only offer the best quality!