These bobbins are used in most older Brother and Baby Lock sewing machines that used drop-in bobbins (not class 15).  these bobbins will fit (but are not limited to) the following models:

Babylock BL60E, BL2100, BL2150, BL6000, BL6150, BL6200, BL6600, BL6700, BL7500, BL7800, BL8000, BL8500, BL9500, BLQ2, ESE, ESE2, ESG, ESG2, ESG3, ESL, ESN, EMI, EMI2, EM2, ESI, ESI2, ESP Espree

Bernina Deco 500, Deco 600, Deco 650

Brother B349, B351, B352, PE100, PE150, PE150V, PE170D, PE180D, PE190D, PE200, PE300S, PE4000D, PC1000, PC2800, PC3000, PC4000, PC5000, PC6000, PC6500, PC7000, PC7500, PC8200, PC8500, PS1000, PS1250, PS1800, PS1900, PS1950, PS2100, PS2200, ULT2001, ULT2002D, ULT2003D, XL3000

Riccar RE200, R3100, R3200

Simplicity SE1, SE2, SE3

Singer Sonota 6680

White W3300

Outside diameter: 21.2mm - Height: 9mm - Axis diamter 6.1mm - Alternative number 136492-151, SA155