For the stainless steel vacuum cup, the cup mouth diameter is important for heat preservation, the smaller the diameter, the better the heat preservation effect. Good quality cola shape insulated vacuum bottle with double layers stainless steel can keep the heat or cold up to 24 hours. It is perfect thermos tumbler for outdoor travel. Wherever you go, you can drink the cold and hot drinks you want. Material stainless steel 18/8(304) inside, Powder coated finish, Non-slip bottom, non-toxic, No metal taste or rust. If you have new style or design for cups, we can coopearte also, welcome your calling or email. Free Shipping, Customized Big Logo.