NOS (New-Old stock) Shimano Dura Ace rear hub cog spacer Color: BLACK (DARK GRAY?) Shimano part number: 3731300 Material: Plastic (nylon?) Size: 7.3mm thick (38mm O.D. and 35mm I.D., not where the tabs are) SOLD INDIVIDUALLY NOTE: This is an NOS item (New-Old Stock), meaning it is brand new, but very old inventory (probably about 25 years old). These came from Shimano in 10 packs, which we are splitting to sell individually, therefore there is no retail packaging. As always, NOS does not mean perfect - it just means old and unused. If you want new, buy new - NOT NOS.
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