This nebulizer set is easy-to-use, hand-held and disposable. Also, it's compatible with all portable and home use compressors, offering fast nebulization times with greater particle density. The nebulizer cup is threaded to prevent leakage and it has a 6 ml capacity. This is a disposable nebulizer set that should be replaced roughly every 2 weeks. Must be hand washed only. Available as individual unit, case of 10, or case of 50. What's in the box: disposable nebulizer (6 ml capacity), mouthpiece, "T" piece, 7' of tubing. Optional 6" reservoir tube or adult mask available. Please see our blog post about the difference between reusable and disposable nebuilzer sets.