Review on 100 Pcs Solder Seal Heat Shrink Butt Connectors, Waterproof And Insulated Electrical Wire Terminals Splice By TICONN by Larry Gaines

Overall I'm quite happy with them, the solder ball is a bit tricky to get melted all the way without the cover getting burned (used a heat gun)Almost didn't get these as someone had posted a review video that shows how one end is smaller than the other, but when used correctly that is a feature not a bug.