They're of the low-bridged variety.
Interesting note on TW-supplied 801 attys, I'm not 100% sure what causes it, but about half of them i've received (out of a total of 3 5-packs), have an absolutely vile burnt plastic smoke from them to start. I strongly advise to stop using them if you detect this, as it seems to cause me some temporary nausea and wheezing.
What I do to fix this is to heat them until they stop smoking like that, periodically blowing the smoke out the back to make sure it doesn't stick around on the inside, and follow it up with a hot rinse if needed. After that, they perform perfectly.