What is the B-Lite gel made of?

The B-Lite gel is created by permanently bonding tiny hollow spheres within the standard medical grade silicone gel, which makes the implants up to 30% lighter. Microspheres are widely used in a range of applications. They are biocompatible and can be found in medical devices and cosmetics. The microspheres are integrated within the cohesive gel and their bonding to the gel remains intact even in the unlikely case of the implant rupturing. 
The B-Lite gel incorporates technology used by NASA and has an excellent safety profile and characteristics, offering significantly less weight while providing a natural look and feel.