GEN 3 - 6.5" - 2 Ohm rear speaker for 2014+ bikes. Small Neodymium magnet used make fit speaker in rear boxes is surrounded by aluminum "slug" to help control heat. 1 Titanium tweeter is very smooth sounding when played at high volume. Sound is tailored to cut through exhaust and wind noise when bike is at speed. Speaker passed testing with 125 watts RMS running them for 8 full hours before power rating was given. Can take peaks of 250 watts (125 watts less than fronts due to smaller Neodymium magnet they had to use).