IMO the best rubber strap for tuna is Zuludiver/Bonetto flat vent style rubber. Personally, I prefer it even over Isofrane on my TunasJust ordered a B&R Aquavent band in red to try on my SBBN033. Basically a knockoff Oysterflex. Saw it from this video. Hopefully it wears well!
Put bright colours, the reassurance of Bonetto Cinturini’s reputation and ZULUDIVER style on your wrist with the expanding, perforated ZULUDIVER 284 Rubber Strap. The ZULUDIVER 284 rubber strap is manufactured to Bonetto Cinturini’s usual high standards.