NIB Swig Life Stainless Steel Stemless 12oz Cup in Rose KEEPS COLD 9+ HOURS, HOT 3+ HOURS. Copper plated, triple insulated wine tumbler is double-walled and vacuum sealed with thick, professional grade 18/8 stainless steel EASY TO CLEAN, DISHWASHER SAFE stemless wine cup. All Swig Life travel wine glasses and accessories (lids and bases) are top-rack dishwasher safe NONSLIP, SCRATCH-FREE, NOISE-FREE SILICONE BASE keeps your stainless steel wine tumbler from tipping over or making too much noise when you set them down