If making your own ring sling or using a ring sling ring for different wrap carries, an aluminum or nylon ring sling is an important tool for the baby wearer's stash. These rings are sold in pairs of two. These rings are made by Sling Rings and come in multiple different sizes. The lighter the fabric weight, the smaller the ring size that should be used. For example, if using for a smooth fabric, light weight Summer sling, choose a small ring size. If using Winter weight fabric, use a larger size. Ring size should not be selected based on the weight and size of the wearer or child. Rings are made of baby safe materials- your little one can chew away! Follow all patterns carefully and test your slings before use. As always- baby wear safely! Close enough to kiss, and keep baby's face visible at all times. Sizes are as follows: Aluminum- Small- 2.5", Medium- 3", Large- 3.5" Nylon- Small- 3", Medium- 3.325", Large- 3.625"