B0301-45/B0302 Alnico Square B0301-45Dia: 87 mm, height: 31mmOutput: nom .3 watt and max .5 wattFrequency range: 250-12000 HzNet weight : 66g Alnico Square B0302Dia: 92 mm, height: 27mmOutput: nom .5 watt and max 1 wattFrequency range: 250-8000 HzNet weight: 72g