Versatile Trim. TruWood Reversible Trim is a composite exterior-grade product manufactured from residual wood fibers using no urea-formaldehyde resins, the maker says. The preprimed material features a textured side - intended to resemble rough cedar - and a smooth side. It's sold in 4/4 and 5/4 thicknesses, and in nominal widths from 2 to 12 inches. It costs about $1.50 per square foot. The Collins Companies, 800/329-1219, collinsco.com.