Clamshells are durable for clip use. They must still match the reader format.
If the site uses thin printable cards, a clamshell may not fit the printer or holder.
CredentialsReviewed 2026-08-28
Clamshell cards
A thick plastic prox card, larger than a thin ISO card.
Also called
clamshell cardprox cardthick prox cardClamshell access cardsclamshell access cards
Catalog fields
Product TypeCredential Format
Source: Transmitter Solutions product training