You will receive 5 tubes in a package. If you select both sides from the drop down menu, you are ordering 2 packages and will therefore receive 10 tubes. Slim HE Tubes will work with the following manufacturers:
The higher the number on the tube, the longer the tubing will be. If you currently have tubes, the size you need will be printed in blue or red on the end where the dome connects. (You may need a magnifying glass and good lighting to see this) Find information and links to Domes under the Related Products tab.