Steve,
I haven't ran my lurcher on pigs yet mate so I've never ran her with the collar on. It's extremely light and my mate (FJager) made them for me in 2002 for other things I was running in another country. I would recommend them to anyone mate as they are tough as and as I say, very light. I will be using them on pigs very soon, but my bitch is just about to drop pups so I've not been doing much with the dogs recently.