Inno Sense Medium Port Inno Sense Medium Port bits are made of an elastic plastic and are slightly harder than the Inno Sense flexi soft bits. Inno Sense Medium Port bits are slightly flexible and have a tongue port. The plastic of the Inno Sense bits is FDA approved, the material is non-toxic and contains no plasticizers. Curb Gag A Curb Gag is a kind of gag with the curb gag cord through the bit and behind the chin. At the bottom of this curb gag cord is a ring to which the rein is attached. When taking the reins, the bit slides up into the mouth and puts pressure on the lower jaw / chin. This bit is not suitable for inexperienced riders. Straight mouthpiece features: A straight mouthpiece consists of 1 piece and gives pressure on the tongue, layers and lips. The shape and thickness of the mouthpiece determine where the pressure will be in the mouth. A straight mouthpiece with a tongue port gives more pressure on the layers and keeps the tongue free. The straighter and thicker the mouthpiece, the more pressure on the tongue.