Yet another thing "developed" to catch the angler not the fish in my opinion. One thing you can glean from the korda dvd's is that carp do not spook off the lead. so why if they don't spook when they can see it do we need invisable weights. We had all this when they introduced the other super weight "stonz" rocks. i have not found one piece of real evidence to prove that any weight is any better then any others. brown, green, black, tarnished lead , shiny lead , rocks with swivels in them camo (sic)leads and now transparent leads. God how gullible are we FFS