This is a definitive back measuring gauge by Zaldi. If you have an unusually sized horse or are in doubt as to what size saddle tree you require then this back gauge can be used to precisely measure the horses back and we will arrange for Zaldi to make a made-to-measure saddle for you. We would send you the gauge in a strong cardboard box and you would need to return this to us after adjusting it to your horse's back. We would then ensure your saddle is made for you to match the gauge. We offer a REFUND OF THE COST OF THE GAUGE if you purchase a made-to-measure saddle from us. Unfortunately the delivery cost is a little higher than we would like due to the size and volume of the box and the packing required, which you can re-use for safe return of the 'shaped' gauge to us..