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These original SlingRings came straight from the company, and are made, packaged and shipped in the USA. Both SlingRings and Lil' Eco are family businesses, with Work From Home Mom's that support Attachment Parenting and safe Babywearing. The Rings come in a wide variety of colors, in either Aluminum (Lead and Nickle Free) or Nylon (Phthalates-Free) and the 5 sizes range from super mini to Large, insuring that you always have the perfect slip-free size for your carrier. All rings are measured from the inside edge to the other inside edge. This is their inner diameter. The nylon rings are SMALL 2 1/4"(5.7 cm), MED 2 5/8" (6.7 cm), LARGE 2 7/8" (7.3 cm) and are 0.4" (1 cm) thick. The aluminum rings are SMALL 2" (5 cm) MED 2.5" (6.4 cm), LARGE 3" (7.6 cm) and 0.25" (.64 cm) thick.