There are 10 light covers. These are for string lights. They were on a strand of lights that quit working. There is an image showing the style of string lights I removed them from. They were pretty snug on the lights. It may take a little wiggling to get them on a new strand. These are aged and have some areas of rust. There are also same scratches on the metal. On one of the lights, the cage part is a little crooked. See images. 

Measure Approximately 2.5" from top to bottom and 2.5" in Diameter.