This is a Vintage Christmas Atomic Strand of Lights. With a retro design featuring a starburst pattern and a nostalgic Christmas theme, these string lights will add a touch of charm to your home or garden. Very long strand is approximately 24 feet long, providing ample length to illuminate any space. Display these lights with pride during the holiday season and bring a bit of vintage flair to your celebrations. i have never seen this shape before really not sure what the name actually is for this type. When plugged in there are stationary ones that light up, once warmed the others come on & off. There r some that do not light up. Made in Taiwan guessing from the 60's- 70's. Sold as is.