Stainless Cable & Railing offers engineered 4x4 and 6x6 posts made from Batu mahogany (also known as Membatu, Selangan Batu, or Red Balau). The company says the posts are manufactured using a unique process that makes the naturally strong wood nearly impervious to checking, splitting, shrinking, warping, and checking. An undrilled Batu post lists for about $53. Matching engineered Batu rails in 2x4, 5/4x4 and 5/4x6 sizes are also available.
The Vancouver, Washington-based company also offers Quattro western red cedar posts, which are laminated to resist checking and splitting. The posts have a hollow core to make it easier to run wires through them. Designed for cable railing applications and available in both 4x4 and 6x6 sizes, they can be used as either intermediate or terminal posts. The cost of an undrilled 4x4 Quattro post is about $48. Matching 2x4 and 2x6 clear red cedar rails are also available through direct order on the company's website. Stainless Cable & Railing, stainlesscablerailing.com.