Nichiha. Two new vertical panel products are available in the NichiProducts line: Stucco and Grooved 8-inch on-center. Both panels measure 5/16 inches thick and 4 feet wide, and come primed in various lengths. Manufactured using the same process as NichiBoard lap siding, the panels are introduced to heat and more than 1 million pounds of pressure to create deeper textures and crisper edges. 866.424.4421.