There is no game of pool practice, so there are no red balls. The 3 and 11 balls are red in the game of pool however.
13
There are seven striped balls in billiards.
Depending upon the game, there are from 7 to 21 colored balls.
15 in a regular game
Pool balls are made of a phenolic resin. This comes from a mix of phenol and aldehyde.
The number of balls depends upon the game. All balls use a cue ball plus 7, 9, 15, or 21 numbered balls.
Friction. The movement of the rolling pool balls does no damage to the pool felt. However, the pool balls accumulate pool chalk that is very abrasive. The pool chalk accumulated on the balls and dropping on to the felt both result in tearing of the felt fibers as balls are struck or slide on the table. Occasionally balls bounce or are jumped on the table, resulting in even more damage. Damaged felt is a part of playing pool.
The pool balls, or billiard balls, are made of multiple layers of material. The numbers and colors are embedded and a part of the material in the last layers.
8 ball pool, 7 solid, 7 stripes the 8ball and the cue ball. So 16.
You have to have at least 1 of the 7 pool balls in order to see the collection.
When you put the pool balls together in formation for the break shot it is led racking the lls.