Regular nipples in 14mm length with 2.0mm threads. In my terminology Sapim Polyax nipples are the regular option because they’re designed for building by hand rather than by machine. The Polyax head acts like a ball joint for improved spoke-nipple alignment, which can be further enhanced by pairing with Sapim Polyax washers. Offered in silver and black in all materials plus several colors in aluminum only. See my blog article about choosing between brass and aluminum.