The F-One Acid 4 (IV) is for new school freestylers. Short and wide up to the tips, with extreme pop for better jumps and landings. Its double concave will suppress any leg splash and absorb vibrations during high impact landings. The F-One Acid 4 (IV) allows sharp edging, great release and insane pop. Light, sharp and responsive under your feet, this board will get you launching huge tricks.