Guide to tennis nets: To start things simply, there are two types of nets, those that go from post to post, and those that don't. Nets which do go all the way from post to post are designed for net posts with an internal winder. Nets which don't go all the way from post to post (usually 300mm short each side) are designed for posts with an external winder.

Once you have decided which net type will suit your net posts, you then need to decide what length you'd like your net to drop. If you want a net which goes all the way to the ground, you need a 3 foot drop and if you want one which allows you to roll the balls under the net to your opposition, leaving a clearance, you need a 2'6" drop. The 2'6" drop is the more popular option as the 3' drop is less practical (although more professional) and it's also a bit more expensive.