The advantage of silica gel is that it is cheaper and basically has no rejection. Disadvantages are easy light transmission, capsule contracture, prosthesis skew or wear. Expander was originally used in heart bypass surgery, and later widely used in clinical plastic surgery. It has many micropores and is highly compatible with human tissues. Compared with silica gel, the swelling body is softer and has better postoperative stability.

At present, the bulk brands are: She Jifeng, Fei Siting, Mei Zhiting, Rolls-Royce, Li Xiu, Chu Zhen and so on. , are commonly used brands.