This is a (new) rubber heater cable for a vehicle, purchased at Cdn. Tire. I bought it for a specific training exercise for Blast, in which I needed two pieces of rubber hose about 10" long.
The cost was about $8. for approximately 6' of hose. I cut off 4 sections for the training articles and the rest has become the most favorite outside toy for all 3. Being rubber, it does not get hard in well below freezing temps. and being black, it is easy to spot in the snow. We use this for retrieving, tugging, and Blast just likes to carry it when we are out on walks. It will probably last forever and is a great sturdy toy. Air it out before using, it does smell like rubber.