●[Important]: Please measure your collar size with a vernier caliper before purchase. If the product you purchased is not suitable, please do not worry, feel free to contact us, TIPIPARK will solve the problem for you ●[Package including]: 6 Pack of Extra Links & 10 Pcs Rubber Covers ●[No need to discard old collar]: Buy some extra links for backup, you can add to the Prong Collar according to the growth of the puppy ●[Easy to install]: Use a vise to clamp the links on the collar and attach the extra links to use ●[Corrosion resistance & Rust-proofing]: TIPIPARK collar additional links using high-quality stainless steel, with good rust and corrosion resistance, can be reused