Split reins with snaps for quick and easy attachment. The snaps are permanently spliced into the rope and cannot be replaced if they were to break (which many snaps unfortunately do sooner or later). I do however also make split reins with removable snaps that can be replaced if you would rather like that, you can find those here
There are 2 rope dimensions to choose from, 10 and 14 mm (3/8" and 9/16"), depending on if you prefer somewhat thinner and lighter reins or thicker and heavier ones. The blue reins in the pictures are made out of 10 mm rope and the black ones out of 14 mm rope.
The rein ends each have a popper made of 6 mm (1/4") rope. The rope poppers are attached to small spliced loops so you can easily replace them with new rope poppers or something else if you would like.