Cue sports tables are usually heated to stave off moisture and provide a consistent playing surface. The length of the pool table will typically be a function of space, with many homeowners purchasing an table as a compromise. Full-size pool tables are 4.5 by (interior dimensions). High-quality tables have a made of thick slate, in three pieces to prevent warping and changes due to temperature and humidity. Smaller bar tables are most commonly made with a single piece of slate. Pocket billiards tables of all types normally have six pockets, three on each side (four corner pockets, and two side or middle
Billiard table midpoint between the bottom and top ; the or , located midway between the centre spot and the top cushion; and the or , located at the midpoint of the baulk line (and, thus of the "D"). Due to its obviousness, the brown spot is not always marked (neither are the unmistakable and , at the left and right intersections, respectively, of the baulk line and the "Ds curve. The exact placing of these markings are different on smaller tables, but proportional to the full-size model. The of a good quality snooker table has a of slate and is covered