A0200C/A0201C A0200C Alnico RoundDia: 50 mm, Height: 19 mm Output: nom .4 watt and max .7 wattFrequency Range: 4000 Fo-HZNet Weight: 40 g A0201C Alnico RoundDia: 57 mm, Height: 19.5 mm Output: nom .3 watt and max .5 wattFrequency Range: 4000 Fo-HZNet Weight: 40.5 g