Are these bubbles in the filiment?

My prints keep stopping and it's getting really anoying.

My previous plastic was good til about 1/2 way through the roll where it had many bubbles.

I can bend the filiment back against the curve and where it turns white, I can snap it off ans see the bubble.

This pic is from a different supplier. The plactic (ABS) is much stiffer (more pressuer on ideler to get a grip) and dosen't show obvious signs of bubbles or even snap like the previous plastic. But it keeps jamming and as I'm running it at 250c I'm hopeing it's not the temp.

Using a J-head .35mm.

Advice is welcome.

They do look like air pockets in the filament, I've never experienced that before. Try Ultimachine, they have very consistent filament.