Color-coded Reformer spring balls help you group and identify your springs based on their resistance. If an O-Ring on one of your spring balls has gone missing or needs to be changed, you can strap on a replacement O-Ring in seconds.

• 6 × Red O-Rings: 100% springs
• 2 × Blue O-Rings: 50% springs
• 2 × White O-Rings: 25% springs