This includes the MB-D10 battery grip and the MS-D10 battery tray (allows the use of double A batteries). Both items are in excellent condition. Compatible with the Nikon D300 and D300s.
http://en.nikon.ca/Nikon-Products/Product/Power-Packs/MB-D10-Multi-Power-Battery-Pack.html
http://en.nikon.ca/Nikon-Products/Product/Power-Packs/MS-D10-Battery-Tray.html