Sentry  24.5 in. Flea and Tick Collar for *Product Size: 24.5 in. *Product Type: Flea and Tick Collar for Dogs *Application: For Dogs and Puppies 6 Months or Older *Packaging Type: Boxed *Active Ingredient: Deltametrin *Odorless: Yes *Coverage Area: 6 month *Fast acting *Kills up to 98% of ticks within the first 24 hours *Long lasting protection injected inmolded collar with notches to fit the collar securely to your pet up to 24.5 in. neck size *Discovery ACC