I'm Alex,head of purchasing. Please below regarding your offer:Currently, we use the products of companies Zebec and Z-PRO. These companies are certified from WhiteWater West.However, if the quality of your products will meet these standards, and the price is competitive, we are ready to consider your offer.We could take some samples from you for testing. If the quality will satisfy us, we will be ready to discuss about regular purchases.Could you kindly provide for us with the following specimens:Single Tubes ZLG48 2 or 3 pcsDuoble Tubes ZLG8M48 2 or 3 pcs at your discretion.Delivery address and telephone: Anyway, feel free to contact me if you have any other questions.Best Regards, Show More