You can make small castanets in a minute of materials that are around you. Look how.
All you need for this little instrument are two plastic caps and cardboard strip
Castanets of plastic caps are made in a snap. First, fold a cardboard strip in half
Apply hot glue on the inner side of the cap and stick it on the end of the cardboard strip. Glue the other cap on the opposite end of the strip.
And that is that. Castanets of caps are ready. You just need to collect a small orchestra, and the fun begins.