They say they are 8mm. I don't know if old fingers can open them. I hope my granddaughter can one day. You need to find bigger locks. My mistake. He also warns against getting them wet. Well I wash my hands with water and sometimes I sweat. And you should be careful with them too. Maybe it's enough if I only wear the bracelet when I'm sitting with my hand on the table and not moving. They each have rings at each end of the lobster clasp. The price around $12.50 is too much.
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