Slap Jack for kids typically comes either as a single-deck multi-game set or as multi-deck packs. Examples in listings include one complete deck designed for multi-game play, 4-deck sets, and 6-deck sets.
Cards are typically made from cardstock or quality cardboard with extra-thick construction. Some listings note blue-core cardboard and a plastic coating for a smoother, more durable finish.
Common sizes shown are pocket-size (about 2.3" x 3.5") and poker/standard size (about 2.5" x 3.5").
Most sets include instructions or a simple rule guide. Listings frequently note that each deck is individually boxed with easy-to-follow instructions included.
These card sets are promoted as travel-friendly and giftable: descriptions mention pocket or compact sizes for tucking into a bag and specifically list occasions like Easter baskets, stockings, birthdays, and travel use.