Brand new, never fitted, Wossner Hi-Comp pistons. These are the 85.5mm version which will need the stock cylinder to be bored. They have bigger small end bearings than stock so need forged rods.

More info of the specific model here
http://www.performanceenginecomponents.com/Products/Product.asp?id=250561

Retail is £560 inc, these are for sale at £350.