[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. Display Vaccination Card at Airlines for Quick Entry.Use and Reuse for a Health Record Keeper .Great for Teachers, Students, Nurses, Office Employees, Doctors, Government Official, Police, Volunteer and More. Durable PVC (poly vinyl chloride) material, wear-resistant and corrosion-resistant properties. WATERPROOF, SEALABLE Clear card pouch is made of flexible,Resealable zipper keeps contents safe and dry,Dual-use hanging slot/holes design, the middle slot for lanyard, keychain or retractable carabiner reel clip, the both side holes for the cord/strap/string/thread. Strong and Flexible plastic material. The badge holders will not leave trace, folded and refolded many time. The hanging Slot/holes will not break, distorted many time. REUSABLE MULTIPURPOSE BADGE HOLDERS -Use for Meetings, Senior Centers, Reunions,Festivals, Retreats, Family & School Reunions, Store Tags, Fundraisers.