I just got my first from AllK-9 and it's a 3/8 40' biothane lead. I spent like $40 on it, but it was worth it! Our rope lead started 'shredding' not too long after I got it, and it just got very dirty and nasty, wasn't the best for the beach and water, etc. Sp I'm VERY happy with the biothane. It IS heavier, but even my 16lb dog can handle it fine. I'll probably still use the rope when we're playing fetch and frisbee and such just because it's not as heavy for him to drag along, but yeah the biothane has been amazing (and it's been rainy and nasty, so lots of puddles and mud).