This is a transmission / transaxle cone-style synchro ring for the output shaft of various Fiat transmissions.
One synchronizer required for each gear.
Fiat X1/9 (1973-88) 1st + 2nd gear
Fiat 128 All (1977-79) 1st + 2nd gear
Yugo (All) 1st + 2nd gear
Fiat 131 All (1st+2nd+3rd+4th+5th)
New and Unused.