Yes, set of six.
Quite a lot of choice, from what I've gleaned.
original RX7 rotor seals good for 50K mile, and probably cause least wear/damage to the rotor housing.
Ceramic rotor seals last a lot longer but cost four times the price and can have a occasional tendancy to shatter (especially on turbos), destroying everything in sight.
Various people make alternative rotor seal kits (some include genuine Mazda springs in the price)
Do a search for "Apex seals" which is the proper name for the seals.
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