Vic Firth/Mike Balter Vibraphone Mallets No.23 B

Best entry-level mallets! Everyone should have a set of these! They are cheap and they sound among the bests on the instruments. If you’re playing jazz on the vibraphone, honestly you’ll get by with only these mallets.
These are good for classical orchestral use too, also in percussion ensembles. They are great even in the marimba.

They do wear out after a while, though, so if you’re a heavy user, you’ll need to replace these eventually.