Have access to a lot of different bags but I'd primarily want to use them on: 135lbs Nazo bag, 150lbs Pro Boxing Supplies bag, 190lbs Aqua Bag, and 120lbs Aqua bag. The nazo and smaller aqua are medium density I believe. I haven't used them yet - they're at a gym I'm considering joining but haven't yet. It's primarily a pro gym. 1on1 in Philly. Jaron Ennis, Stephen Fulton, and others train there. Not a pro fyi. The pbs and larger aqua bag (at my current gym) are hard as fuck. The aqua is filled to the brim so there's no give and the pbs bags are 6 months or so old. There's a few solid pros but it's mostly fitness people who can't punch so the pbs haven't broken in. I'd be using them exclusively for bag work 4 days/wk 12/rds per session 288 -864 punches per session. I'm not a light puncher. I could rotate them with other gloves so they'd see less action potentially. The new oxbloods I have on the way are 12oz. From what I've read, Fly premiums have changed their padding and you have the older, softer version that's more suitable for sparring? Guessing your old trainer did as well? How long did his fly's hold up though? How long did his winnings?