Dated 1980's here’s a 17-foot string with 15 brand new bulbs. Green plastic covered wires are in good condition with no breaks or wrapping that would indicate repairs. Noma stamped on the plug. Plastic clip on each socket for hanging on your tree branches. Bulbs are independent. That means if one burns out, the rest stay lit. You don’t have to test each one individually looking for the bad one. Extra bulbs included. Indoor use only. A word of caution: These bulbs do get hot just like those in your regular lamps. We used them safely for many years but they always decorated live (balled) trees or those cut fresh from a local tree farm. Keep in mind that trees purchased at roadside lots and big box stores have usually been cut 4-6 weeks or longer before delivery And remember no more than three strings of lights plugged into one outlet.