The TFT Tuned Stainless Steel Drink tumbler. Available in Several Sizes and Colors. TFP Logo Laser Etched on the Front and Tuned with True Frequency’s Proprietary Frequency Technology. The Tuning process creates a structured more Healthy water. This allows for better hydration, and improved health and well being. You will also find it improves the taste of Water, and improves the flavor of Coffee, Juice’s, Wine and other non carbonated drinks by reducing the acidity and balancing the ph. May cause carbonated drinks to go flat. Try one today you won’t be disappointed.