Collar - Heart Lock Connector Neck Collar with Key Holographic Pink. Collar - heart lock connector neck collar with key holographic . Who will you give your key to? Beautiful & soft pvc locking collar with a heart lock. Wear this sexy choker to add a little bit of naughty to your outfit! Or makes a great present for your slave or loved one. One size fits most. Length: 14" includes collar, heart lock and 2 keys - now available in 8 colors best selling - black, red, aqua, hot pink, holographic white, holographic pink, holographic blue & holographic gold.