10 Metal Bobbins. Fits the following models of Necchi........

108, 522, 523, 524FB, 525FA, 534FB, 534 Supernova Julia, 535FA, 536FA, 537L, 539, 541, 554, 574, 575, 4795, 3102FA, 3355, 3537, 3577, 4575, 4795, 6010FB Omega, 6011, 6018, 6022, 7020, 3204FB, 3205FA (Royal Series), 4595, Julia, Mira, Supernova, Supernova Ultra Mark 2, BF, BU, FB12, Nova 

Also fits the following models of Nelco........

6102FB, A-3, A-509-3, F-600, JA38, N-250B4, R-400, R-1000, R-2000, R-3000, R-4000, SZA800-L, SZA-820-L2, ZZB-1 


Bobbins measures 7/16" thick x 13/16" wide.