Big black tube doesn't shrink well

At first the package came with variety sizes which is good, and for the price I have no complain. Then when I tried to used on my speaker cable, some tubes shrunk well, but some didn't. Especially the big black tube, they didn't shrink at all, the red were good. My cable are 16 gauge, and I found I have no use for all the small tubes, so before you bought it, make sure you have to use all the size, some is really small. I will order only one size that I use most, it would be safe money for you.

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