The slotllocks are decent carts they are a little higher priced then t tech but they do have a membrane.. I used them a few times yesterday and I like the mags a lot.. They rinse clean very easy.. The groupings are just like kingpin needles and hopefully they do some bold liners as well.. I don't like the fact that their are only diamonds so far for liners but that's a personal preference.. I did have one cart head pull of from my grip when I went to remove it but time will tell if that's a re occurring thing.. I will speak more on the other carts I have coming and more in depth on all three this Sunday as I have a few appts this weekend👍👍