These are a very rare pair of Brembo 320mm racing cast iron superbike rotors. They were spares that came with an ex-Jimmy Adamo/Reno Leoni Ducati F1 TT1 that I purchased from Pablo Real. They have an 80mm center hub hole with 101.5mm mounting hole diameter spacing, and will fit wheels that were used on Ducati F1, TT1/2, 851/888 Kit and Corsa race-bikes, and Bimota motorcycles. They have a 25mm offset and have friction surfaces that are 5mm thick.

The rotors and carriers are identical in dimensions to the rotors that were used on all 888 Corsa race-bikes (except 1994 with wide hub 5-spoke Marchesini front wheel) but have a radial spoke pattern on the carriers instead of the triangle and diamond pattern that was standard on those bikes. These are very rare early race parts that were not typically for sale over the counter. I have never seen another pair of these for sale before. The only bike that I have seen that had these fitted as standard was the Bimota YB4R racebike that won the TT1 F1 World Championship in 1987 (see attached photo) 
The rotors are in good condition with no wear to the carriers where the rotor friction surfaces/buttons mate. The buttons, shims washers and E-clips are all brand new. There is some staining to the friction surfaces due to light surface corrosion that will come off after using the rotors. One of the rotors has some very slight erosion of part of a friction surface (.001") on the outer edge due to corrosion (see photo), but this will probably come off with use and should not affect braking ability.
International bidders please contact me for shipping cost