Is there a way to specify certain media for a given backup schema?

We curently have both weekly and monthly backup jobs and we're currently using LTO5 tapes but have a whole slew of LTO4 tapes that my manager wants to use for our montlies (as those are kept indefinatly and we'd like to use up our LTO4s). Is there a way to specify either an entire set type (like LTO4) or even a tape by tape basis so our monthlies will pull from the LTO4 tape set?

Thank you!