Stotz.

These square shaped weights are a must have if you intend to catch Carp with a rod or a pole. When the line is stretched, they will not 'ping' off the line like small Split Shots can. This makes them perfect for making more delicate pole rigs in today's Carp driven world. They are also easier to attach to the line than shot, and they don't roll away when you're not looking! Only available up to size No.1.