MANCHESTER, N.H. — Thin, sharp and difficult to spot.

The TSA says it has found a growing number of credit card knives at airports.

The knife fits in a wallet and is slightly thicker than a credit card.

Officials say they’ve found over 60 of these knives at airports this week alone, including at an airport in Manchester, New Hampshire.

The agency is reminding travelers to check their bags and other belongings for prohibited items before going to the airport.