I would not buy this product again. You assume by the cover of the package that there is an equal number of vertical and horizontal lined cards in the pack,, but this is not what the package contains. In a package of 24 cards, only 8 of the cards are vertically lined. it is misleading and definitely not worth the price. The description of "24 double-sided cards" in a pack along with the picture of the two types of cards leads you to believe that each card has vertical lines on one side and horizontal lines on the other side, and/or there is an equal number of each type of card in the pack, but this is not the case. Don't waste your money on this product.