Which strings come pre-looped?

Got some string here but I can’t remember which it was. It is pre-looped, do you guys know which of the major strings come pre looped?

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Yoyofactory string comes pre-looped, so does some chinese bulk string.

Slackies. The yellow is twisted with white and I believe they do the same with their green

YYE strings come prelooped the last few times I bought 100 packs