This is a super handy all-in-one kit for setting up or upgrading your aquarium's air system! You get a full 32.8 feet of black airline tubing - that's plenty for most tanks. Plus, it comes with 10 air stones to create those fine, oxygen-rich bubbles, 10 one-way check valves (super important to stop water from siphoning back into your air pump), and 10 suction cup clips to neatly secure the tubing to your tank glass. On top of that, you get 5 'I' and 'T' shaped connectors for splitting or extending your air lines, and 5 air control valves to adjust the bubble flow to each stone. Everything you need in one package. The tubing is flexible and standard size. The air stones help dissolve oxygen better for healthier fish. The check valves are a real lifesaver for your pump. Super easy to use - just connect everything up. Great for beginners or as a backup/spare parts kit. Makes maintaining a good oxygen level in your tank a breeze.