"Permapro" flexible or rigid paving curb are an excellent choice to brace and support concrete pavers and slabs. Permapro paving edge is designed to adapt to straight or curved installations. It is especially easy to use and quick to install, thus saving time and money. Extra versatile system. Choice of rigid or flexible paving edges. Flexible edge has been designed to avoid cutting in curved paver installations. "Twist lock" feature provides a rigid connection allowing continous support. Bracing on the vertical wall provides additional support. Made with thicker gauge plastic for additional overall strength. Black. 8 ft length.