DT hidden nipples are designed for high profile rims, where the inverted design is essential for optimum precision. It is very light and hidden on the inside of the rim and therefore, perfectly suited for high aero wheels. The nipple will align perfectly due to its spherical contact surface. Specifications:- Product type: Hidden (F)- Material: Aluminum.- Approved for e-bikes: Yes (max. 32Km/h or max. 250W)- Thread: 2.0 / FG 2.3- Length [mm] (L): 12Technology: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.