When I got my copy of the Monsters expansion, I was disappointed to learn that the Hogwarts cards were lighter in color on the backs as well as slightly bigger then the base game. This made the cards both easy to tell apart from the base game (which isn't needed since all the cards are marked where there're from) and impossible to shuffle with the base game cards since they stick out and naturally become separated from the base cards. I was beyond upset by this until I found this these sleeves~!
Not only do they get rid of the color difference problem, but both my base game and monster Hogwarts cards fit perfect in these sleeves. I bought two packs of these sleeves so I had enough for these games and future expansions (I've barely used any from the second pack). They're well made and none of the sleeves have split apart like some sleeves I had for other games. Probably the only downside is the Hogwarts deck is now even bigger and taller then before, but I'm beyond happy that I can finally play the expansion and have no troubles with shuffling my cards~! I can't wait to sleeve my Charms and Potions expansion which I'm ordering today.
One more thing, vaibhavhospital had the best prices on these sleeves and fast delivery. Some places were charging almost double for one pack in US dollars!!! Plus shipping to Canada would be the cost of getting the sleeves from here. This is the best place to get them in Canada is your local gaming shop doesn't have them.