Blue collar type flea and tick treatment, effective for 7 months. - Brand: DoggyMan - Color: Blue - Size: For medium and large dogs - Effective period: 7 months - How to use: Collar type flea and tick treatment - Features: Removable clinch I opened and tried it on once after purchase, but it didn't fit, so I'm selling it. The package has been opened and the surface is torn, but there are no tears on the back and inside instructions. I only tried it on to see if it would fit.