T-221 is a grooved hardwood trunk slat with rounded edges. This item attaches to the trunk with our decorative trunk slat clamps such as T-116. Each slat is 36" long by 2 1/4" side by 1/4" thick. The slats are made of hardwood but can be gently bent to fit a dome topped trunk. To make it more pliable, we suggest soaking it water before attempting to shape it on your trunk.