Weaver Original Adjustable Halter with Snap Features: Convenient, adjustable nylon design Rolled throat design on horse sizes Flat throat design on suckling, weanling, and yearling sizes Brass halter hardware Brass throat snap Top quality nylon Heat sealed oblon buckle holes Box stitching at stress points True-to-fit sizing Guidlines For Sizing Halters Newborn Sucking/Small Miniature - 3/4" (100-200lbs) Weanling 3-6 months/Small Pony/Miniature - 3/4" (200-300lbs) Yearling/Medium Pony - 1" (300-500lbs) Small Horse/ Large Pony - 1" (500-800lbs) Average Horse - 1" (800-1100lbs) Large Horse/ Warmblood/Oversized - 1" (1100-1600lbs)