For over 100 years, one of the biggest names in the tennis industry has been Tretorn. Since the founding of the company in 1891 in Helsingborg, Sweden, Tretorn has been dedicated to quality products at the best prices. Originally producing quality rubber boots, the founder of Tretorn, Henry Dunker, realized the growing popularity of tennis and decided to switch his focus to the production of tennis balls. The rest, they say, is history. Tretorn was the first company to produce pressurized tennis balls as early as 1930, followed by pressureless tennis balls in 1950. Today, Tretorn is one of the leading manufacturers of tennis equipment in the world. Make sure to check out Tretorn's products here at Holabird Sports for quality, professional tennis equipment.