The Swig - 12 oz. Stainless Steel Tumbler with Polypropylene Liner. Shape of a Stemless Wine Glass. Double-wall Stainless Steel With Polypropylene liner. Splash-resistant clear acrylic lid with gasket seal. Excellent promo gift for any business. FDA Compliant ñ Safe for Food Contact. Hand Wash Only - Do Not Microwave. Individually Poly-bagged.