This listing is for new old stock 3 Pack GE 50/100/150 Watt 120 Volt A21 Soft White 3 Way Incandescent Lamps (3 Bulbs). These lamps have a standard medium base. They are rated 1200 hours when operated at 120 volts. 

Your satisfaction is guaranteed. All items are shipped via the US Post Office (USPS). I make every effort to ship your item within 24 hours following receipt of payment, except for Sundays or Holidays when the post office is closed.