They've been around for years, ever since the advent of Equipment in 2003
ZEXAL episode 78: "The Adventures of Artimus Stanleyus" 219.0 219.1 Yu-Gi-Oh
Fortunately, were getting something for the extra money
Here we have an Unlimited Base Set 2 Booster Pack and did we mention it's sealed
The horsemen are this time only represented by Arabian Nights

How To Double-Sleeve Lorcana Cards Youll need a pack of inner sleeves and a pack of outer sleeves Holding the card upright, take a single inner sleeve with the opening on the bottom and push the card up into the opening Make sure the card goes all the way to the top Place the card on a flat surface and press the air out with your hands flattened Take an outer sleeve with the opening at the top and hold it in one hand, with thumb and forefinger on either side Pull your thumb and forefinger in a money counting gesture to open the outer sleeve With your other hand, hold the middle of the inner-sleeved card Slide one of the bottom corners of the i nner-sleeved card into the outer sleeve Slide the inner-sleeved card in slowly You can push from the top, but that can leave the inner sleeve to slide off a little Instead, push the inner-sleeved card down with just one finger on the inner sleeve at the back of the card and pull up with your thumb on the outside front of the outer sleeve Get the air out of the cards again Congratulations, you have double-sleeved a card
