There are 54 out of 60 in the box. As written in Title they expired but there is really no problem using them and it does not affect the activation of the material!

User manual:

Place one tablet in a container with warm water

Soak the prosthesis / brace / brace for 30 minutes (possible all night)

Rinse the prosthesis / brace / brace with running water.

Pour the solution immediately after use and wash hands