This app has a VERY basic bit of information about the different "bats". My focus is tennis and did not spend much time with other areas in the app. The information is general about typical size and weight of racquets and size limitations. The information about materials is old...big emphasis given to aluminium and alloys while today most racquets are graphite/carbon fiber composites. There is no info about individual racquet models. Just the few general overview paragraphs about the racquet category.
Good.
In depth details.