They are very firm, but what we are using them for, they are fine for our program.

Will shatter in cold weather. Otherwise good product.

Hey Frank Butler, in regards to your review, it's not a chew toy. It is a training tool. The problem you have is with the dog and the trainer, not the product. Get some one to teach you how to properly use an electronic collar and you can stop that chewing in no time.

Dogs chewed ends off in first 1 or 2 uses

Not very durable. Bought two. One has already been chewed thru at the rope attachment point after just a few times using it. Buy the FIRM knobby dummy instead. 100 times as durable, only 76 cents more.