What size MicroSD card can i put in 8gig Fuse and 4gig Fuse?

MP3 players Sansa Fuze
1

I have two Fuses, an 8 gig and a 4 gig. What is the largest capacity MicroSD card I can use for each of these?

2

The same for both: any microSD or microSDHC card up to 32 GB (although 16GB is the largest currently available).