Some sports books offer pre-made teaser and parlay cards that you can fill out prior to getting to the betting window. The most common type of these betting cards is the half-point parlay card. Each game is assigned a half-point spread (i.e. -3.5, -7.5, etc.) to prevent ties. Bettors can choose to wager on as many games as they’d like, usually up to 15 selections depending on the provider with pre-determined payouts. The more games that you choose, the more you can potentially win. In addition to the half-point parlay cards, some oddsmakers offer pre-made teaser offerings as well.