There are certain legal risks in cooperative processing of supplied materials, which mainly involve the following aspects:

1. Contract disputes: Both parties should clarify their respective rights and obligations when signing the contract. Such as product quality, delivery time, price, etc. If one of the parties breaches the contract, a dispute may arise.

2. Intellectual property infringement: If the raw materials or designs processed with supplied materials infringe the intellectual property rights of others (such as patents, trademarks, etc.), you may be sued and bear corresponding liabilities.

3. Product safety issues: If a product processed with incoming materials has safety issues (such as injury caused by improper use), consumers may complain or be sued and bear corresponding responsibilities.

Therefore, before proceeding with processing with supplied materials, it is recommended that both parties fully communicate and sign detailed contract terms to avoid potential legal risks. At the same time, relevant laws, regulations and standards must be strictly followed during the production process to ensure product quality and safety.