The outside cladding of this borescope is braided stainless steel sheathing. It is usable to a maximum temperature of approximately 125 Degree Fahrenheit. The minimum bending radius is 2.00". It is constructed of 10,000 individual fibers with a 25X magnification eyepiece. Depth of focus is from .25" to 2.00" with viewing to infinity. The "J Series" can be used with the FB-6 Fiber Bundle connected to the FOI-150 Halogen Light Source, which is strongly recommended especially for video applications or the 6 Watt LED Battery Handle. There is a control knob on the side for articulation which allows for approximately 90 Degrees in both directions. It is fully flexible for its entire length and is video adaptable.