A butterfly gag is a wing-shaped gag that is usually inflatable by means of a rubber bulb.
This practice requires greater caution, since the risk for asphyxiation is high.
In practice, it does not silence the subject very effectively.
A more effective variant of the over-the-mouth gag is called the cleave gag.
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For this reason, the OTM gag is associated with the typical damsel in distress. A tape gag involves the use of sticky tape sealing the mouth shut. If the wearer blows while the tape is on it makes it easier to remove as they can chew it off , making it not the most effective gag. Instead of being tied over the person's mouth, the scarf or cloth is pulled between his or her teeth. A ball gag is usually a rubber or silicone sphere with a strap passing through its diameter.