Alcyon Glass Ring MR16 track head features a glass shield which adds a decorative flare to the minimal design. Wireless stem with infinite horizontal rotation, compact electronic transformer housing, and lamp forward design for easy relamping. Vertical pivot from 0 to 90 degrees. Available in Matte Black, Matte White or Metallic Aluminum. Etched borosilicate glass twists on/off. One 50 watt, 12 volt GU5.3 MR16 halogen lamp is required, but not included. UL listed. 2.75 inch diameter x 2.75 inch depth x 4.75 inch length. Compatible with Lytespan Basic 1-circuit, Advent 1 or 2 circuit, and Radius 1-circuit track systems.