Information: It is made in plastic with light weight. Equipped with electronic contacts which transfer exposure data . All automatic functions work well and there is no need to set them manually. As for AF engine and TTL auto exposure in modern lenses there is no need to worry, it works perfectly well with extension rings. The Auto Extension Tube Set for Nikon 1 mount Camera and lens is a set of two extension tubes for mirrorless interchangeable lens cameras. This set has tubes of 10 mm and 16mm. The tubes can be used individually (10mm, 16mm) or in combination (10mm+16mm=26mm) to obtain the desired magnification. Compatible All Nikon 1 Mount Camera (such as: Nikon 1 S1/J3/J2/J1/V2/V1..ect)