Simply order your suitable rope collar with your chosen rope, rigging and carabiner for your configured rope and save!
Please measure where the collar should sit, normally close - not too tight and not too loose, plus 1 finger in between, results in the neck circumference we need!
Measuring a normal collar does not lead to the desired neck size! Then there is a risk that it will not fit. The dog's collar length and neck circumference are not the same. The length of the collar is always greater than the circumference of the neck.