Genuine Brother part. Fits many, many models of Brother and Baby Lock machines. Measures approx 1/4" thick and 1-5/8" in diameter. Image is from the Brother parts catalog.
Specifications
Guaranteed to fit Babylock Sewing Machine Models:
BL9500, BLL, BLSO, EAC, EMI1, EM1, EM2 ESPREE, ESG, ESG2, ESI, ESI2, ESL, ESP

Guaranteed to fit Bernina Sewing Machine Models:
Deco 500, Deco 600, Deco 650

Guaranteed to fit Brother Sewing Machine Models:
PC5000, PC6000, PC7000, PC7500, PC8000, PC8895, PE100, PE150, PE180D, PE200

Guaranteed to fit Simplicity Sewing Machine Models:
SE1, SE2, SE3

Alternate Part Numbers: X57045051
Other Images

icon 64500: Brother X57045051 X57045001 Felt Pad for Spool Pin, Many Models, Babylock