The ball is made from aluminum alloy or stainless steel (thick: 5mm -15mm). It is firm and airproof and the design is up to the requirement of: four preventions: Shock proof Vandal proof Water proof (IP68) Erode proof flat designed optical window uses toughened glass whose thickness is 5mm, and prevent distorted images with greatest extend and protect the built-in integrated camera. 360 degree continuous pan rotation, 350 degree tilt rotation