This training aid can help in the development of a correct headset by teaching the horse to engage their core. These reins are made of durable cord with quality hardware and rawhide accents. Easy-to-use, simply clip the sliding scissor snaps to the bit and the bolt snaps to the girth/saddle. A helpful tool for training the young horse! 5/8" x 8 1/2' This is a more advanced piece of training equipment, seek out a trusted equine professional for guidance and education on proper use.