Heart Bar Frog Support Series. In each shoe, the heart bar supports or stabilizes P3  through the frog. As a general rule, the point of the bar should be 1/4" to 1/3" behnd the apex of the frog and in full but gentle contact with it. Frogs should be soft and pliable. Compression should not exceed 1/8" of the frog. These shoes should be applied with x-rays and the consent of a veterinarian. The Egg Heart (GCEH) with full support is a shoe for long pastern or under slung horses. The D or straight heart bars (GCDH) is for horses with high heels or upright pasterns. The Egg Heart in D bar with blunt toes (GCDHB) or heart bar with blunt toes (GCEHB) help to reduce the strain of breakover.  Sold in pairs.