This one is quick release version. Easily and quickly attach and detach. Material: metal and plastic. Net weight: 260g * Precise design, with AB Stop, Follow Focus ,which have easy begin/end setups for fast repeatable racking between two points * Additional marker design besides AB hard stop. * The particular part of this follow focus is that it can use different size gears. It can work with 3 different size gear to meet your different needs with various lens: . 38x0.8mm pitch, diameter: approx.28mm (not included) . 43x0.8mm pitch, diameter: approx.31mm (included) . 65x0.8mm pitch, diameter: approx.49mm (not included) * Package including: Fotga M4 follow focus X 1