The TA Twin (5.55") is the ideal twin set for the MR (Mark Richards) style twin fin fish. With a performance rake and finely tuned foil, this twin set will drive your twin fin surfboard through full, wrap around cutbacks and big turns off the lip. It's younger brother the TA Twin 5.1 offered in hexcore will further loosen your twin fin with its smaller stature. Add a trailer to the TA Twin 5.1 and realize the dream of the twin trailer fin setup. As well, replace the front fins of your quad set with TA Twin 5.1 to provide more hold and control.