Product Description Material:Food grade 18/8 304# stainless steel. Single or double:Double wall design ensure beer cold over 24 hours and hot over 12hours. Surface treatment:Pickling passivation and Magnetic polishing to eliminate metallic taste. Imprint method:Silk screen/etched/laser printing. Color&Logo 1.Laser printing:Deep colour as black most exquisite among all printing methods. 2.Silk screen printing: Mult-colour ink available Baking after print the ink on the stainless steel surface. Keep image lasting longer. 3.Etching printing: Single colour; Use chemical liquid connecting with electronic power, get corrosion logo imagesIt's more durable. 4.Stamping: Available on bottom and lid. Stamped your company name, website address, Goverment warning and etc. If you have any question, please contact us.