HVL-F58AM is for Sony HVL-F58AM flash. Product description: the material is soft and flexible which can match well with flash. It has an accurate color temperature. When it is thin, it looks transparent; thick, the molecule is lattice which makes the flash light scattering and looks translucent. Its temperature resistance is up to 130 degree. With good flexibility and cracking resistance, it has a stable chemical property. The material: polyethylene. It is used in plastic wrap and some other non-toxic food package.