DT Pro Head nipples are designed for short spokes with a large angle of deflexion such as for e-bike use. Through the spherical contact surface, the nipple aligns automatically with the angle of the spoke, which leads to a homogeneous power transmission. The special shape of the head prevents the nipple of tilting in the rim base, which is a great advantage for wheel building. They are available with or without the patented DT Pro Lock locking system. Note: brass nipples are not approved for childrens products in the USA.