Hello dmattmul
Dolphin L is 37" long x 1.25" dia. x 0.040" wall thickness CF Tube.
Dolphin L is 940 mm long x 31.75 mm dia. x 1.01 mm wall thickness CF Tube.
Dolphin S is 33.875" long x 1.095" Dia x 0.040 wall thickness, the CF tube has plugs inserted into both ends to make a area for the screws to thread into, which are located approx 0.6" in from the end.
Dolphin S is 860 mm long x 27.8 mm Dia x 1.01 mm wall thickness
I used electrical-insulating fiberglass sleeving, for example look at the following:
http://www.cabletiesandmore.com/Brai...emperature.php