The QiYi CFOP Algorithm Set consists of 3 color-coded, double-sided plastic cards with algorithms for solving all of the F2L, OLL, and PLL cases. Great for learning CFOP algorithms while on the go! Grab this if you haven't already. Each of these is the size of a credit card so it's easy to bring along with you anywhere (Might be a little hard to read but that's understandable). Really useful for when you're traveling and have no internet access and you want to learn CFOP. These are good for learning algorithms on-the-go. They are the size of playing cards, and they are very sturdy. You can carry them in your pocket and not worry about bending them. If you came across this and you don't do the CFOP/Fridrich method yet, this is a great way to start. Those three cards are really good, as they come at a great price and they are really portable. They will easily fit in your pocket; they are really useful on the go. Solving puzzles and brain teasers are important activities to teach kids to work hard at solving complex problems and foster your kid's sense of space and enhance a child's memory.Whether you're trying to stretch your brain capacity or spending some leisure time with your loved ones, this would be a great gift for your kids.