Width is slightly under 1" or 24 mm Leather is 100% genuine cowhide leather. Match with a basic round buckle plated in old brass finish Dimension of buckle is 1.75" (outside diameter) Measurement as follows: S/M: Start of leather to 1st hole 30", to middle hole 32",to last hole 34" to the tip end(total length) is 38" M/L: Start of leather to 1st hole 34", to middle hole 36",to last hole 38" to the tip end(total length) is 42" L/X: Start of leather to 1st hole 38", to middle hole 40" to last hole 42" to the tip end(total length) is 46"