Class 66 Bobbins Pack of 10 for Singer Sewing Machines Model 66

Dritz® Class 66 Metal Bobbins

10 PCS #172222 Metal Sewing Bobbins For Singer Class 66,66-6,99,99-13,185,185CL,192,201 Sewing Machines Accessories - AliExpress

LORJE Sewing Machine Class 15 Metal Bobbins(10pc)

Class 66 Bobbin

Here is the complete tension assembly taken from an antique Singer Model 66 Red Eye sewing machine. This would also fit Singer Model 99 machines as

Antique Singer Model 66 Tension Assembly from Red Eye Machine - Complete Assembly also fits Model 99

Metal Bobbins for Singer Models 66 66-6 66-16 99K 99-13, 101, 185

Bernette Bobbins 10 Pack

The SINGER Threaded Class 66 Bobbins with Storage Case can be used in SINGER and other manufacturers top drop-in bobbin machines. The pack contains 6 black-threaded bobbins, with 50 yards of thread in each, and 6 white threaded bobbins, with 50 yards of thread in each. The reels come in a reusable plastic case. All thread is 100% spun polyester. Consult your machines manual to ensure correct bobbin size.

Singer 12 Piece Class 66 Threaded Bobbins - Each

25 Singer 15J Bobbins for CE100 & 200

Dritz 928 Metal Class 66 Bobbins-4/pkg