Generic Dark blue disc is suitable for all pool surfaces. Similar quality copied part for Baracuda range of Automatic Pool Cleaners. This generic part fits on the Baracuda Pacer and Classic models fits onto the  flexi foot at the bottom of the pacer swimming pool cleaner.

If the disc is torn or warn out it will not clean the complete radius of the disc.

The disc and flexi foot wheres out more or less at the same time and would probably have to be replaced together.