For most of wraping methods with sling rings you need TWO sling rings. You can combine any colors.
Sling Ring inner diameter: Sling Ring large 7,7 cm
Sling Ring outside diameter: Sling Ring large 8,7 cm
Safety standard: California Prop. 65 CPSIA Section 101
Fabric: Aluminum (ring)
This rings are testing by AM Testing and compliant to California Prop. 65 – Lead Cadmium and CPSIA Section 101 – Total Lead in Substrates
There can be minor difference in the colouring of the rings.