One piece will provide enough material for one pair of skis, or one snowboard.
Tip: Use a jig saw to make room for the tip/tail spacer material as shown. Attach the tip spacers to the tips and tails using small amounts of super glue. The super glues prevents the spacers from shifting during the layup process. Note: there should be enough spacer material to generously overlap the ski's edges. The excess material is trimmed during the finishing step.