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Great question! They have radically different weight profiles. If I had known this when I listed them, I definitely would have included this info (and have since updated the listing). They are FX100s as determined by the stamped working pressure of 3442, which means an empty buoyancy (with valve) of -8.4 lbs vs the MP3180 which has an empty buoyancy (with valve) of -15.8 lbs.They look like painted Faber. Are they MP3180 or FX100?