PLEASE NOTE Check measurements before purchasing. The suitable vaccine card size is 4" L x 3" W, but it is not used only as a vaccine card protector 4x3. It is larger than most 4x3 card protectors. If you think the vaccine card protector (Another Size 4.25" L x 3.5" W) doesn't fit, flip it over and slide the top underneath, and it seals closed. Please refer to the second and third figures. WATERPROOF AND SEALABLE CARD PROTECTOR This CDC vaccine card protector uses safe durable material, wear-resistant and corrosion-resistant properties. The vaccine card protector sleeve is made of a flexible, resealable zipper that keeps contents safe and dry solid and flexible plastic material. The badge holders will not leave a trace, folded and refolded many times. The hanging Slot/holes will not break, distorted many times. WIDELY APPLICABLE This CDC vaccine card holder has a Dual-use hanging slot/holes design, the middle slot for lanyard, keychain, or retractable carabiner reel clip, both side holes for the cord/strap/string/thread. REUSABLE MULTIPURPOSE BADGE HOLDERS You can use this vaccine card holder in Meetings, Senior Centers, Reunions, Festivals, Retreats, Family & School Reunions, Store Tags, Fundraisers. DISPLAY CDC VACCINATION CARD PROTECTOR FOR QUICK ENTRY Reusable and Transperent CDC Vaccination Card Protector. Great for Teachers, Students, Nurses, Office Employees, Doctors, Government Official, Police, Volunteer and More.