Our main products including magnetic stirrer, heating mantle, pipettes, centrifuge, vortex mixer, vacuum pump etc. We have strong cooperat. On with them and if you have express collected account, you will no need to pay us. For bulk order, it would sent by sea. We have our cooperation forwarder and you also can use your forwarder. If you need to return, please double check to confirm the item not work and contact our customer service representative, let us know the detailed problem and send us some pictures for confirmation. We greatly appreciate your.