mid-range. There are many kinds of mid-range grades with high cost performance. Tantuo is a brand registered by Suzhou Yingde Clothing Co., Ltd. in China Trademark Office. It operates in a wide range, including tents, sleeping bags, furniture, barbecue products, bags, shoes and clothing. Tantuo brand has passed NSCC sporting goods quality certification, which is solid and durable, not easy to be damaged, inexpensive, generally available within 1 yuan, and cost-effective. Therefore, exploration belongs to the mid-range grade.