We buy a lot of different treats / chews and these are by far the worst.
We persisted for a bit but our dog would not eat them. I tried breaking them into smaller pieces, still not bothered. Then tried soaking them in water to soften and so concerned about what they broke down in to that the whole bag has gone in the bin. A real waste but the colouring, large stringy pieces and clear lack of goodness was obvious and not surprised the dog wasn't keen.
I do not recommend.
My dogs love them .... I give them a few in the afternoon and in the evening .... I never exceed three or four a day .... and I have never had problems with stomach or color .... I have been buying them for a long time and I will keep buying them .... when there's an offer on 600 pieces ... I stock up... and they keep just fine ....
I bought the chew rolls for my Labrador/Ridgeback/Dogge mix. Predictably, they last half a minute at the most. To make them last a little longer, I put them in his Kongs: either whole or snapped in half to make it harder to get to the sticks and keep him busy for a while longer (I then hide the Kongs all around the flat and wrap them up for good measure)