Everyone has those almost empty impression material cartridges that they do not know what to do with—not enough to take a new impression, but too wasteful to throw out. Don't throw them away! With an improved, form-fitting design, 1:1 Refill-Ease™ Cartridge Transfer Connectors let you combine good, unused material from multiple partial cartridges to produce one full cartridge. One connector can transfer an entire batch of cartridges at a time. For use with 1:1 high-performance (rounded flange) automix cartridges. Also compatible with the redesigned Sultan Genie VPS cartridges. Six plastic connectors per pack.