ABS + silica gel: Our lung trainer is made of super flexible, pure silicone, non-toxic, odorless, harmless and environmentally friendly. Almost anyone can use it without side effects. Easy to Use: Improved Lung Capacity: The breathing trainer increases lung capacity and endurance through targeted exercises. Ideal for anyone who wants to improve their respiratory health - without aerobic training. Adjustable resistance: The deep breathing lung trainer was developed with adjustable resistance & you can customize your breathing exercises & thus improve your endurance. Wide application: The lung trainer for deep breathing is small and easy to carry and can be used for adults, seniors, children, swimmers, athletes, singers, etc. Product description: Perfect lung trainer to regain lung strength and quality of life! With it you specifically support lung regeneration and can breathe deeply again after years of smoking - free from shortness of breath, phlegm and coughing. Individually adjustable resistance: Adjust the breathing device to your pace and well-being. Just a few minutes of daily training is enough to strengthen your breathing strength, lung volume and lung function. Ideal for smokers and ex-smokers who want to improve their health. Compact and easy to take anywhere. Lightweight, portable, and space-saving. Whether at home, in the park, or on vacation, this breathing device is ideal for daily breathing exercises. Don't miss any opportunity to regenerate your lungs and increase your breathing capacity. Naturally chemical-free. Enables effective, chemical-free lung cleansing and breathing therapy that helps loosen mucus and keep your airways clear. This allows you to train sustainably and without side effects to improve your breathing strength and vitality in the long term. Perfect for quitting smoking. The ideal tool for restoring lost lung strength. Regular breathing exercises promote lung cleansing and help you leave smoking behind for good for more endurance and better fitness. Specifications: Material: Silicone + ABS Size: 10 x 6 x 3 cm Weight: 37 g