TREE Design don't have member grades.
By other means, TREE Design use Mileage.

◈ Mileage Guidance
 1. Mileage is available for purchasing products.
 2. If you join TREE Design, we give you $2.
 3. If you order goods, we give you Mileage. (The Mileage is 3% of total product price. But shipping fee is not included.) 
 4. Minimum mileage required for use is $10.
 5. If you have more $10, you can use the Mileage in next order.
 6. The amount earned will not be refunded for cash.

Have a fun shopping!
Thank you.