At just over 2mm thick, this ring is not bulky and with multiple NFC chips the range is better, then any other NFC ring on the market today.
Hypoallergenic Hardened Advanced CeramicInlay cover: Hypoallergenic Epoxy
OPERATING LIMITATIONSForces:Can withstand drops onto most surfaces from 5M. Drops onto Ceramic and harder surfaces shouldbe avoided.Temperatures:Overall recommended temperature maximum exposures:Min: -20cMax: 110cIC Limitation:Min: -55cMax: 125cEpoxy Limitation:Min: -20cMax: 110cBlank Limitation:Min: -85cMax: 1668cWater resistance:Protected from high pressure washer jets from any direction