made tennis products started to manufacture parallel products for frontenis when Becerra started to win championships. In the 1990s a Mexican company, “Master Pro”, was created exclusively to manufacture frontenis products. Recently, other companies have appeared specializing in frontenis equipment. Simple strings is used in Preolympic frontenis, and the tension varies depending on the ball — Penn strings require 15-19 kilos, VIP strings require 17-21 kilos, and Champion Elite strings require 17-23 kilos. Double strings (duplication of 4 horizontal strings and 3 vertical strings) are used in Olympic frontenis in order to give more effect to the ball. Double stringing demands higher tensions, between 21 and 27 kilos. The ball The ball in Olympic frontenis (the only modality accepted by the IFBP) is the Olympic ball. Originally, the sport was played with ordinary tennis balls, but the fiber cover of these balls slowed them excessively, reduced their bounce, and made the game very slow. To speed the game, the fabric cover of the tennis balls was removed. Later, balls made of oilcloth were imported from England and the United States with the goal of further speeding the game. During the Second World War, ball imports ceased, and Francisco Beltran was forced to look for substitutes. He experimented with pressurizing rubber balls. After the Second World War, Beltran started manufacturing improved balls. A few years later the first frontenis ball company, “201”, was founded by Francisco Beltran who contributed his ball designs and Doctor Jesus Ledezma who provided financing. Ball design continues to evolve. External links Basque pelota Sport in Mexico Sports originating in Mexico Forms of tennis Racket sports Games and sports introduced in 1916 1916 in sports