Custom Tumblers & Travel Mugs, The Calais Spill Proof Mug - Stainless Steel & Temperature Control, Spill-Proof Flip-Top lid Durable powder-coating. Made of 18/8 stainless steel. Copper-lining keeps drinks cold for up to 24 hours & hot for up to 12 hours. We have eliminated single-use plastic packaging materials on our powder-coated reusable bottles. ... #S902 $8.09/each.