Maars Maker 20oz Matte Black Tumbler The perfect tumbler for any occasion, the Maars Maker personalized 20 oz tumbler is made with double-wall, food-grade stainless steel, keeping drinks hot for 12 hours and cold for 24 hours. The powder-coated exterior with its smooth matte finish is a pleasure to the touch, while the non-tapered shape with the slim design makes it highly practical and stylish. The plastic screw-on slide lid with the color-matching straw adds extra practicality points. All materials used for this tumbler are non-toxic and BPA-free.