Mcoplus EXT-SP Auto Focus Macro Extension Tube Set for Sony A Mount Alpha Digital SLR Camera Lens A33, A35, A55, A65, A57, A77, A290, A390, A500,A550,A900,A560, A580 Moves the lens farther from the image plane, allowing greater magnification and the loss of light for macro photography 3 tubes that make up Singly or in combination makes it usable in 7 different lengths Material:Brass Chromed mount + ABS(Acrylonitrile Butadiene Styrene) body 3 tubes included 13mm, 20mm & 36mm Extension tube set for Sony Alpha digital SLR cameras