This is a reel of 0603 parts.
They could be resistors or capacitors, a full reel with tipycally 5000 parts.
I'm selling them not really to be used as components, but for learning how to solder, or for testing automatic SMD placement machines, such as a pick and place.
A full reel just for 1$
Hallo from Germany, thats a very cool item! (MultiKitB)
Michael Uhlmann