Pre assembled so you can't break it yourself, perfect if you break your existing one. I use an Ender 3v2 and it failed for months after trying to upgrade to all metal MicroSwiss and the brass atomizers went sour. The bolts were snapped, the wrench was bent, and I haven't been able to put on anything that fits my life, and when I could, the hot end wasn't heating up properly. I spent over eighty dollars on all of these parts and pieces and figured it would be best to just throw them away - and this package was more or less perfect. You'll have to open up the motherboard and remove the cables from your old hotend, thread it through the cable wraps and pack up the new cables, but it's relatively easy and there are plenty of short video tutorials on YouTube. Swap out the hot ends, screw them back in, and after some alignment you should be good to go again.
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