A big lot of C-7 Mid Century Christmas light strings, more than enough for a 6 foot tree. There's one extra long 33 foot string by Paramount with 25 lights. A Noma string holds 15 lights and is 15 feet long. The other three 7- light strings (Clemco, Gilbert, and unknown) are over 9 feet each - more than 75 feet total. All work fine as you can see, and all the bulbs currently light up. However, these older Christmas tree bulbs can burn out at any time, so I'm including six packs of spare bulbs (29 in all), all tested and all working.