The DT Champion Stainless Steel Spoke in black is a very high end spoke used by riders of all styles of bikes.
This page lists the size options from 178mm to 188mm which should cover most 20" hub and rim combos you may be dealing with. If you are unsure of what size you need pick the option "I'm not sure" in the drop down menu and provide us with as much info as you can about the rim and hub combo you plan to lace in the comments box on the cart page.
The price is for ONE spoke and one matching brass nipple. If you are lacing a 36 spoke wheel be sure your order enough to do the job. If you have any questions feel free to give us a call at (248)-951-2475 or shoot us an email at firstname.lastname@example.org