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. Full cheek: The side pieces of a full cheek have 2 bars on the side and therefore cannot be pulled through the mouth. These bars create more pressure on the horse's cheeks, which makes maneuverability easier. A full cheek is stable and quiet in the mouth, ideal for training young horses. Depending on the type, thickness and material, a full cheek is given a sharper or softer effect. 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.