As with spokes, there is a nipple to suit to every wheel requirement. To decide which nipple is best, you must weigh up the available information:
The rounded design of the Patented Polyax nipple head reduces the stresses produced by axial and lateral forces (inherent in wheels with low spoke counts and crossings). Polyax nipples re-align themselves within a rim hole up to 9 degrees in a radial direction and 6 deg in an axial direction, making for a much superior fit. For this reason Polyax nipples are packed with all Chicken Cycle-Kit spokes.
Sapim makes nipples in nickel plated brass and in aluminium. All nipples are forged.
Arguments in favour of a brass nipple are price and rigidity. The strength/weight ratio is the principal argument for a 7075 alloy nipple. They are both superior to all other makes. Anodized coloured alloy nipples will help guard against corrosion as well as look great.
Secure Lock nipples