Blue Sweet Iron Polo T Bar Gag W Copper Roller Bit Size:Cob 12.5cm this sturdy horse rug by this sturdy horse rug by GG Australia is made from a heavy poly cotton ripstop material We will help you find the perfect fit wherever you are The T Bar was developed to have the same effect as the traditional Fulmer in that it will prevent pinching on the sides of the mouth however the shortened and extended pins above and below the bit prevent the bit firstly being pulled through the mouth and secondly has the effect of guiding the horses head into the direction the bit is facing which is great for schooling and training purposes the link in the middle is shortened to 40mm increasing bar and tongue pressure making the bit sharper than conventional link bits