There are some basics to remember when using Magical Crimping Pliers. First, 2x2mm crimp tubes are used. Second, only .018", .019", and .024" beading wire can be used with the pliers. And third, there MUST be a wire tail tucked into the beads below the crimp. A traditional crimp tube is flattened, hugging the wire the full 2mm length. The bead created with the Magical Crimping Pliers grabs the beading wire where it enters and exits the tube, not in the center. Without a wire tail, the beading wire could more easily be pulled out of the crimped bead, which happened to some pearls I strung for my young rambunctious granddaughter. I drilled larger holes in three pearls on each end of the strand and remade the necklace. It is still going strong.