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A personal favorite from my Etsy shop https://www.etsy.com/listing/217407548/stainless-steel-silver-heart-lock-key

Dragon Scale Chainmail Padlock Choker - Stainless Steel Black Heart Lock Bondage Collar - Gothic Fantasy Jewelry

Silver Chainmaille Choker Day Collar with Sparkly Blood Red Heart Lock | BrainofJen - Jewelry on ArtFire

BDSM Slave Collar, Byzantine Chainmaille Submissive Locking Day Collar, Small Heart Padlock, More Colors Available

BDSM Slave Collar Byzantine Chainmaille by TheCagedFlower on Etsy