This is original plastic take-up spool made by the Arsenal factory in Kiev in the mid-1970's.

The part is NOS (New old stock), it comes with the original case with the Arsenal logo on the bottom and the "Kiev" marking on the top.

The spool will work with any Kiev or Contax camera, on either take-up (receive) or feed side.

Note: the plastic case you see on the picture is not included (the new batch I was able to source came without it)