We promise to serve you from the beginning to the end as following:
1. Supply 25kgs sample to your address,that is free charge to you.
2. Dispatch our Tech Engineer to your site to teach you step by step by doing
3. Garantee you are successful to master the progress of the usage
4. Flight charges for our Tech Engineer will be costed by us
5. Hebei Shuangyuan Shengfeng Tech.Co.Ltd