The development and testing of a 2. 6 cm inner diam, high field and high current density solenoid, wound with a Cu-stabilized, fine filamentary Nb//3-Sn cable, and reacted after winding, is described. A 0. 9 m-long, 10 cm-warm bore, beam line quadrupole magnet, wound with the same cable, is being assembled. The nominal parameters are given. The design of this magnet, related to the ″wind and react″ technique, such as the conductor insulation, coil winding technique, execution of connections, etc, is discussed.