This is the 30mm water cap. It’s cheap and useful. Before you will order the cap from us, you can send your own preform samples to us, for checking if the cap and preform is really in good match. If it has any error, we can depend on your samples to modify the our mold. Normally, the MOQ for 30mm water cap is 100,000 pcs, and you can also order any color you want. We can also open the new molds. The cap material is 100% new material. It’s safety and healthy.