Two-tone necklace design:
1.5" means that the back is 1" and the biothane part of the attachment is 1.5"
BioThane® is a strong, durable material that does not stretch, is water-resistant and does not absorb bad odors.
Hardware:
Brass, nickel, or black-plated hardware. Unfortunately, the black-plated hardware tends to flake off over time.
Size:
When ordering, please specify your dog's neck size when adjusted. This measurement corresponds to the middle adjustment hole from the end of the buckle. The collar has 5 adjustment holes for a total of 5 inches. 
Identification plate:
An optional ID tag is available and is installed using double-headed rivets to ensure optimal identification of your pet. The tag is coordinated with your choice of collar hardware. The tags are 50mm wide and 13mm high. They are made of brass (gold), stainless steel (silver), or aluminum (black). To add it to your collar, select it here: https://biowildcollars.ca/products/plaque-didentification