If you work with resin you may have seen the beautiful examples of cut tube pendants where a piece of copper pipe is cut to a small width, then the inside carefully filled with resin so you have a double sided pendant - well these take all the hard work out of it!  Nice and chunky pieces of zinc alloy, with an opening measuring 32.5mm and an external width of 35mm with a 2.5mm ring on top.  

Completely hollow, you can fill these with a variety of things, think yarns, resin or resin clay or even polymer clay (though the latter may need a dot of glue).  To use with resin, sit the piece over a strong piece of sticky tape, so that the edges are well sealed and no resin can leak out.  Pour a first layer and let it set, then start to add your inserts (think dried flowers, miniature toys, cutouts etc) and then finally finish with a top layer of resin.  You may need some nail varnish remover if there is any sticky residue once you peel off the tape but the piece should look perfect! 

Available in antique silver finish.