Features: Suitable for all EF & EF-S mount lenses. Combined of 3 tubes with different length of: 13mm, 21mm, 31mm; Can be flexibly combined into different lengths to use. Built-in electric pins, perfect for macro . Superior pin which can tighten the tube joint, TTL and autofocus. Colour: Black Material: Aluminum alloy High and compact, net weight only 102g, super lightweight and portable. Specifications: Suitable: For all EF & EF-S mount lenses Item Weight: 102g / 3.6oz Note: Only the macro extension tube ring is included. Contents: 1 x Auto Macro Extension Tube Set Only the above content, other are not included. Note: Light reflection and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.