L/XL Includes one gray and one black silicone ring. Fits ring sizes 10-12. Ring size 20.2mm dia x 8.7mm wide x 2mm thick
M/L Includes one gray and one black silicone ring. Fits ring sizes 7-9. Ring size: 18.1mm dia x 8.7mm wide x 2mm thick

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We use biological sex to ensure you're getting the right amount of nutrients.