8 Foot self-adhering flexible sink form. Will conform to most undermount sinks. For double bowl sinks, the sink form can be notched with a utility knife to bridge the divider. Sink must have vertical walls. For tight radius corners, sink form can be heated with a blow dryer or heat gun to soften the plastic so it bends easier. If using a zero radius sink, sink form will have to be cut into 4 pieces (one for each side of the sink)