This leash is a reliable item. Due to the practical nylon material, this leash will not stretch or crack. It has a comfortable handle which is hand-stitched. You can be sure that it will not rub your palms as the handle is soft and comfortable. There is a brass snap hook which is resistant to corrosion. With the help of such a snap hook, you will be able to easily attach the lead to a collar or to a harness. The leash is great for tracking, pulling, training and walking your Bullmastiff. If the main features of a good leash for you are strength, durability and reliability, then this lead is right what you need for your Bullmastiff.