The 400 Pack Arjiekwei Card Sleeves are specifically designed to protect baseball cards measuring 3 x 4 inches. Made of durable white plastic, these sleeves come in a pack of 200 hard sleeves and 200 soft sleeves, providing a total of 400 individual protectors. With a manufacturer part number of Arjiekwei-TOP-2003, these sleeves are lightweight, weighing only 3.21 pounds, and have dimensions of 4 inches in length and 3 inches in width. Ideal for sports memorabilia collectors, these card sleeves offer reliable protection for precious card collection.