This pond liner joining tape is a bitumen strip which provides a water proof sealed join. This can be used to increase the width of your pond liner to accommodate any size pond. bitumen is long lasting as well as being completely safe for fish, pond life, and, of course - water features. This is for use with our Liner (Click here to view) And our Underlay (Click here to view) Dimensions 7.5cm (3ins) wide x 600cm (236ins) long