The O'Brien Spark wakeboard rides deep in the water, allowing the rider to generate line tension effortlessly, maximizing the 3-stage pop at the wake. The Fusion core in the Spark wakeboard provides just a bit of flex for added snap when slashing, boosting, and softening landings. A triple concave hull through the midsection transitions into defined channels exiting at the tips and providing unparalleled thrust to the wake. The variable has extra volume through the center for a more forgiving transition, while the unique centrally located molded fins offer exceptional balance and control while on edge. Spark 133: 52.4"L x 16.8"W. For 90-170 lb. riders. Spark 137: 53.9"L x 17"W. For 140-220 lb. riders.