Several Avery business cards are 10 per sheet, 2x3-1/2 inches. The different numbers represent different colors, textures, pack sizes or printer compatibility (inkjet or laser or both), but most of the 10/sheet business cards share the same template. The exception is our glossy business cards, which have a gap down the middle so have their own template.
You can design these using the 8371 template in Avery Design & Print Online
Here's some information on recommended printer settings.
If you want more information about a specific Avery product, search for the product number on avery.com.