Extender Silicone Tube Diameter?

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Recently I went into a hardware store and saw a roll of tubing similar to silicone tube used in some [words=https://shop.mattersofsize.com/products/sizegenetics-penis-extender]penis [words=https://shop.mattersofsize.com/products/sizegenetics-penis-extender]extenders[/words][/words]. The one I saw was 1/4".
So anybody has one, what is the diameter of the silicone tube?
The outer diameter that is.

thinking about modding my [words=https://shop.mattersofsize.com/products/sizegenetics-penis-extender]extender[/words] with came with a strap.

 

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