FLASH BOOST Internal Weight System SHIMANO: Closer to Nature, Closer to People New to the North American market, the Sephia Clinch 2.5 FB squid jig integrates Shimano's FLASH BOOST technology to trigger strikes from these highly-visual hunters. FLASH BOOST technology suspends reflective foil on micro springs within the clear section of the lure body and constantly emits a fish-attracting flash during the retrieve – even on the pause. Displaying an erratic swimming action when worked aggressively, an internal weight system within the Sephia Clinch 2.5 FB enables the jig to remain horizontal as an angler works the lure through the water column.