Unless requested otherwise, my straps will not have tubes in them. I do stock tubes for 22mm, 24mm and 26mm straps however, so if you want me to fit them to your strap please be sure to mention this in the “order notes” field on the checkout page when ordering. There will be no additional charge made if you request tubes fitted to your strap, but please be aware that tubes are only recommended when the strap is to be worn on a Panerai Luminor watch. Fitting a strap with tubes is not a good idea unless the watch is a Panerai Luminor!
This blog post explains what tubes are, and what function they perform.