Sprenger Satinox 14mm Single Jointed Stainless Steel D Ring Size:115mm shock absorbing gel Colour:Forest Green shock absorbing gel The Cavallo Harbor Fetlock Boots boast a durable hard shell design Sprenger 40925 Satinox single jointed D RingThe D ring is 90mm and the side bars give you more lateral supportergonomic shape enables even pressure distribution on the tonguelies anatomically correctly between the tongue and palatal archallows direct pressure transmission on the tongue and lower jaw due to the fixed cheeks and gentle pressure on the polllies steady in the horse's mouth gentle on the corners of the mouththe lateral contact helps horses that tend to fall out whilst riding or approaching an obstacle