This is the Graphite T4 Upper Deck from XRay. Part # 301195
CNC-machined upper deck of premium-grade 2.0mm thick graphite material, specially designed to fit the new narrow bulkheads. The shape of the rear portion of the top deck has been specifically designed to achieve maximum traction and in corner steering. The top deck is machined from premium-grade 2.0mm graphite. An optional #303071 belt tensioner can be mounted to the top deck.