I got my flexwatt from Reptile Basics and it had the straight "cut anywhere" lines, this is by design according to their flexwatt guide on the site. Here's a quote of what they have written in the Flexwatt FAQ.
"The element that we sell has been specifically chosen for reptile rack and cage use and can be cut to almost any length. Some of the 11" heat tape you will encounter on the market is what is known as "panelized" and instead of the straight, black element lines it has a zig-zag pattern. The panelized element is best cut at the designated cut lines (approximately every 12"). It is for this reason we use and sell the continuous element version that can be cut virtually any length! "
Personally, I'm glad I got the straight line, as it gives much more adaptability for choosing the length of heat tape I desire.
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