I had a little chat with Ali Hamidi, via twitter, about this product. He was quick to state that it's just like using a lead clip and that fish trail line regularly (doesn't really answer how that's safe). I then mentioned the fashion of using leadcore with helicopter set ups and my fears of fish trailing long lengths of the stuff, to which he replied "never use more than 2ft of leadcore. None of us do". I think the "None of us do" remark meant the Korda team, which is clearly false as Danny Fairbrass has a video on the Korda site of him using a six foot length of leadcore for a chod rig and the packaging of Kable (Korda's leadcore) recommends five feet! I replied stating this and Mr Hamidi hasn't responded since.