Hi,
You're not supposed to cut any of them through the black part as far as I know - that is the conductive heat element.
The only difference with the 11" is that you cannot cut it in less than 12" lengths from what I recall. You might be able to just trim it back to a clear plastic section and reuse it?
You are supposed to cut thought the clear plastic gaps between them - and remember you need to use insulating tape over the ends of the contact strips down the sides before fixing it down with foil tape to prevent shorts and shocks.
dr del
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