Designed and produced by scientists associated in the ISES (International Society for Equation Science) cone for bridle matching. Some of the riding guides recommend the "two fingers" rule as a protective rule through too close noseband closure, but nonespecifies where to place them or what size they actually have. The ISES cone standardizes the dimension of one and two fingers of an adult human. If the noseband is correctly fitted, the cone can be inserted freely between the nasal bone and the noseband. In addition, on the cone there are markings allowing to check the dimensions of bit bit lengths. Keeping the distance between two fingers of an adult person under the noseband allows horses to express their emotions (including those that are symptoms of discomfort and conflict), and therefore remains in line with the basic rules of equestrian ethics. According to the recommendations of the ISES International Equestrian Science Society, in all equestrian disciplines, the noseband fastening should be controlled by a qualified person. To maintain the impartiality and objectivity of this assessment, the ISES cone was designed. It is recommended to use the cone also in everyday riding practice.