Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Ruff Dog K9 discs

You need to look around but this is the best Frisbee type disc on the market. I could not properly exercise my border collies without them. The small once re the perfect size. They are much easier on the gums and teeth then the hard vinyl and they will sail a long way. Don't use them as chew toys. Some sites are still offering them below $6. They have gone up in price with the rise in the cost of petroleum.