The most important component in any batting cage is the netting material. Why is it so difficult to compare? Go to one site and you'll find N30 netting. At another you'll find a 1500 series. So how do you compare N30 to 1500? It's tough. Most batting cage manufacturers don't want you to directly compare, so they code the net twine size.

As a general rule, netting comes in twine sizes. The smaller the number, the thinner the twine. A #24 is about twice as thick, and twice as strong as a #12 twine. A #36 twine is about twice as thick and strong as a #18.

Example: One company sells a 1500 series net. You might think they mean #15 twine size, right? Wrong. Their 1500 series is a #12. Their 2100 series is a #18, and their 4000 series is a #36. Their own numbering system is close enough to the popular twine sizes that people naturally assume a direct correlation. This is deceptive.

Twine #18 (2100 Series) The very minimum for batting cages. With light use may last 2-3 years.
Twine #24 Pretty good. Not commercial, but a decent net. With moderate use may last up to 4-5 years.
Twine #36 (4000 Series) A very good net. Universally considered commercial quality.
Twine #42 Many pro teams use #42 twine for heavy use. Great for commercial batting cage applications

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