SB6 is for breaststroke swimmers with co-ordination moderately affected on one side, highly affecting the lower trunk and legs, those with short stature, or the absence of limbs.
These swimmers have reduced all-round power and stroke balance. Those with short stature have better balance but are affected to a greater degree by their ability to transmit the power into the water due to the length of their limbs and by higher levels of drag. All have difficulty maintaining good body position.
Swimming SB6 was a competition class at the Tokyo Paralympics