1. The supporting ring is made of high quality nickel-titanium alloy material, with good support and sufficient  expansion weight, which is convenient for specimens to be placed 

2. The bag body is made of high strength TPU material with good biocompatibility, which is soft and high  strength 

3. The bag body can be retractable design, convenient for intraoperative use 

4. The bag body has various specifications to meet different surgical needs 

5. It can be used through 10mm puncture device for convenient operation 

6. Disposable use to avoid cross-infection