●[Card Size]:The maximum Suitable Vaccination card size is 4" L x 3" W.If you think the card holder(Another Card Size 4 1/4X3 1/2 )doesn’t fit, just flip it over and slide the top underneath and it seals closed. ●[Suitable occasion]:Suitable for Teachers, Students, Doctors,Nurses, Office ●[Material]: Made of Durable PVC , WATERPROOF ●[Package]: You will receive 3 card holder. ●[Reusable]:Reusable card holder.