When you cinch down the five locking straps on the Head Harness Muzzle, your captive will know who is in control. The fitted mouthpiece cups his jaw and covers his mouth to keep him quiet.
Click for Head Harness Muzzle – Gag & Locking Buckles
Prefer without the gag? Then get Padded & Locking Buckles
More Bondage / BDSM gear from Mr S here