The LungTrainer Classic is the original lung training device. This unique breathing device incorporates the IBA (S or B series) to monitor the amount of air flow used and weighted inserts to control the amount of pressure applied. One full insert is calibrated to .5 psi, the same as the balloon used with our individual breathing assistant models. Each Classic comes with 3 full inserts, allowing for a pressure generation of up to 1.5 psi. This increased pressure is ideal for instruments that require more back pressure, such as the trumpet, oboe, and French horn. LungTrainers’ respiratory exercise equipment is FDA cleared and crafted from only food-grade and medical-grade materials. Includes: 3 Weight Inserts One Way Exhalation Valve Optional Accessories: • LT Terminal • LT Sidekick • LT Freshen Product Price :- $325 Shop now:- https://lungtrainers.com/product/lungtrainer-classic/