Abundant Quantity: There are 5000 key envelopes in the package, enough to meet your daily use and replacement needs. Portable and Lightweight: the key sleeve measures approx. 3.5x2.36 inch. Durable and sturdy: The hotel key card envelope is made of paper material, which is thick, reliable, durable, and not easily faded. Deep Thumb Cut Design: These hotel key card holders feature carefully designed deep thumb cuts that allow guests to easily slide in and out of the card, providing thoughtful and convenient use. The hotel key card envelope can be used to store hotel key cards, credit cards, ID cards, membership cards, travel cards, business cards, etc; It is also suitable for travel and daily use.