Hrp Flak 1000 Black-Youth The Flak Jak 1000 is a continuation of the classic Flak-JakTM design. It has all the great features of our past designs like the genuine clear anatomically molded panels that have twice the impact strength of solid plastic and the pivoting shoulder system that allows the Flak- JakTM to conform to your bodys shape Floating shoulder net system Crystal clear polycarbonate panel plates One-way detachable bicep system