The X4 is an incredibly controllable hyzer-flip maximum distance driver. Make it slice through winding fairways with ease and with extra glide gain that extra distance to lower your score. Bend it around any corner and watch it glide to victory. The 400 series is a premium blend of material that is extremely durable. The unique blend of plastics feels as good as it looks and will be able to be broken in over time. This tour quality plastic gives the thrower better grip even when it is wet.