I used these flash heads with my CD 1200 power pack. The power pack is now fried and is not worth repairing. These are Ascor Light CD Flash Heads with modelling lights. They can be used with the Ascor CD 2400, CD1200, QC1000, and QC8 power packs. They have an umbrella mount and handle, and modeling lamps up to 150 watts, but do not have a forced air cooling fan like their beefier brothers. They also have a lighter weight cable, but they still work well. Two come with the protective metal cover, and a third comes with the standard reflector. I've taken very good care of them. They are in very good shape. I'm looking to get $110 each or $300 for the set + PayPal fees + shipping.