The skirts of the tables and the legs are made of furniture grade plywood with an oak hardwood veneer on the face. The top of the rail (only) is a synthetic material with a phenolic (or similar) impregnated mixture. This formula has changed over the years depending on which company was supplying the rail top. It is super hard, won't ding at all. Harder than the Formica on the GC's. The oak veneer plywood can be painted black (possibly other solid colors), or stained in several choices. The oak is very porous and shows the cathedral grain, even when painted black.
I "think" you can also get maple veneer plywood, which is a closed pore wood, and the finish will be much smoother, even if solid paint color. 99% of the tables you see in the wild will be oak veneer. Its the standard.
That is for the Pro-Am and Professional.
You can also get the rail tops in solid wood, with choices of cherry, oak, maple, etc, and either have them stained or painted. This might look prettier, but it will ding when balls hit it.
Edit to add: in the 90's and 00's, the "common" style was the oak-veneer plywood legs/skirts stained in a reddish/brownish tone, and the dymondwood top rails to match. As shown in post $58.
Today, and for the about the past 5 years, the "common" style is oak-veneer plywood painted (not stained) flat black, with black synthetic rail tops. Any current tournament you see will be like this.
Black rail tops were not available in the Dymondwood days. It was a limitation of the process.