Bellows design parameters are shown below:

1. Bottom diameter
2. Hole diameter
3. Bottom wall thickness
4. End length L1
5. Pitch
6. Inside diameter
7. Root diameter
8. Outside diameter of end
9. Outside diameter
10. Number of convolutions
11. Free length
12. Total length
13. End length L2

Multiplied bellows are producible by putting a number of tubes together as shown in the figure. This type of bellwos is effective in improving the characteristics.