SB, Left and right wing feathers reference which wing of the bird the feather was harvested. When visually inspecting a right wing feather the feather curves down, left to right. The backside, or the wider area is what is used for manufacturing the feather for arrow applilcation. The left wing is just the opposite tapering down from right to left from the base to tip. There is very little difference to most shooters, but there is a difference if you shoot finger style. If you are a right handed shooter there is slightly more clearance with a left wing. The opposite applies if you are a leftty. Look at the right and left clamps for fletching. Each is bent slightly to one side or the other. This is refered to a helical. You can adjust the amount of helical with quality jigs. The more helical the greater the spin or revolution. The down side is the more helical equals more drag and less speed. A helical of 1/16" to 3/32" over the length of the fletching I found to produce very good spin with minimum drag. A right wing will give you better clearance. When shooting a release there is virtually no difference because the cock feather is down rather than out with little or no side kick or fishtailing. Straight fletching works the best with a release aid. Experiment with both.