The ball is hard and slightly smaller than a racquetball with an extremely active bounce and actually it is only made by 2 brands in the whole world.
In the early days, all balls were specially fabricated and imported from England and U.S. Then Lugardo Torres from Mexico city and the Rizo brothers from Guadalajara city started to fabricate frontenis balls but the product was only in the market for a few years. By the days of World War II, the imported balls were difficult to get because of the war and they were too slow or defleated because it cannot be stored for months.
In 1945, Francisco Beltrán started to experiment with the balls using an hypodermic needle to inject gas, covering the hole with a patch and vulcanizing it but he had not much success. Then he researched for a rubber maker and, after setting up a "laboratory" at his kitchen, he started to make frontenis balls by his own and test it. After those fails and successes he associated with Dr. Jesús Ledezma, his capitalist partner and founded the first ball factory called 201. After a few years of business they dissolved the society and Dr. Jesus Ledezma keep working with the 201 factory. Then Francisco Beltran moved to Guadalajara city and there he founded Pelotas Beltrán with a product called Superbote Beltrán.
As the founder ot the only two factories in the world of frontenis balls, Francisco Beltrán can be considered "the father of frontenis balls".
The official specifications of the ball to practice this game are: 47mm diameter, 47~50gr, 57 shore, bounce of 1.58 meters (2 meters fall with an ambient temperature ball). It could be made in white, yellow, orange and in dark colours where walls are painted white. Almost all are made in white colour because dark green painted walls are most common.
It can be played with a slower and bigger ball called in slang "Bola Gorda". It has almost the same bounce twice bigger but the game runs at slower speeds, it's ideal to learn this game before get in practice with a fast ball. It has the same dimension of a tennis ball but is all made of rubber.