Composite Timber - Dura Composites.and Dura Cabana. ? Strong and Durable. ? Quick and Easy to Install. ? Designed for Extreme Climates. ? Low Maintenance. ? Eco-Friendly. ? Long Life-Span. Dura Pergolas in Teak . and will not splinter. The material is UV stabilised and above all eco-friendly . Four Post WPC Pergola with GRP reinforcement. Six Post WPC.