8 styles to choose from, each one can be 1 or 2 colours max with an exception of style 2 which can be 3 colours max.
 
Measurements must be precise or error on the side of caution and select the adjustable buckle. The measurement is still important but this adjustable buckle will give you a few inches adjustability. The adjustable buckle is not a great choice for petite dogs as the paracord section will be very small.
 
These collars are not recommended for dogs that pull hard during walks.