4 New, 4 volt .75 Watt Sound Exciter small Bulbs /Lamps  For 16mm Bell & Howell 1535, 1540, 1541,1500, 1552, 1552-B, 1574 Projectors.  You Get  4 New, 4 volt .75 Sound Exciter Bulbs.   *These are Not unknown surplus bulbs.  Four New Bulbs. Also See My Store Search Box for Other Projector Bulbs & Projector Belts.  thank you.