This AF Extension Tube Set (Aluminum Colorful Version) can perfectly transform your Lens into a Macro Lens for great Macro shooting. It drives the lens by film or digital sensor and does not affect aperture and image quality. Meanwhile, it is combined with 3 pieces of different tubes (length: 13mm, 21mm, 31mm) which can either be used separately or in any combinations (totally 7 different combinations) to satisfy your different magnification requirement. Furthermore, the tube is electronic one that can achieve functions of Auto-focus as well as TTL auto exposure by working with all EF and EF-S mount Canon lens. Auto Extension Tube: 13mm,21mm,31mm,13+21mm,13+31mm,21+31mm,13+21+31mm Specifications: Color: Red Materials: Aluminum, PC, ABS Compatibility: For all EF and EF-S Canon lenses Macro tube size: 6.2 * 8cm / 2.4 * 3.1in (D * H) Macro tube weight: 146g / 5.1oz Package size: 9 * 7 * 7cm / 3.5 * 2.8 * 2.8in Package weight: 185g / 6.5oz Package list: 1 * Macro Extension Tube Set 1 * Bag 1 * User Manual