DT Pro Head nipples are designed for short spokes with a large spoke bracing angle 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. All brass nipples are recommended for e-bike use. Features:Pro Lock:- Pro Lock is a thread lock function which prevents the spoke-nipple connection from loosening, allowing for extremely durable wheel builds. Specifications:- Product type: Pro Head (D)- Material: Brass.- Approved for e-bikes: Yes (max. 32Km/h or max. 250W)- Thread lock: Pro Lock- Thread: 2.0 / FG 2.3- Length [mm] (L): 14Technology:DT Pro Lock® Technology:- DT Pro Lock is a process where a dual compound, adhesive liquid is injected into the nipple thread, allowing for extremely durable wheel builds. By threading the nipple onto the spoke the adhesive is activated and starts to harden. Re-truing the wheel is still possible after the adhesive has hardened completely, with only a minimal decrease of its thread-lock function.Nipple Technology:- The interface between spoke and nipple is highly important for the durability of a wheel. A good reason for DT Swiss to continuosly improve and fine-tune the DT Swiss nipple range in line with the different requirements of the various cycling-disciplines. All nipples are available with or without the locking system DT Pro Lock.