Stainless Steel ; Polypropylene plastic screw on/off top gasket; Designed for use withslimcans and bottlessuch as those forspiked seltzer and energy drinks (not designed for use as cup); Vacuum insulation helps keepyour cans and bottles cooler longer; Remove top lid gasket to insert can or bottle and screw back on to secure in place; Hand-wash only; Product Size: 6″ h x 2.7″ dia.;