This 20piece Coilcraft inductors pack features hollow copper wire coil inductors designed for RF and tuning applications. The compact 3.5 x 2.5 x 0.7 form factor and multiple turn options make these parts suitable for FM frontend circuits, remote control RF modules, and experimental projects. Key features Brand and type: Coilcraft hollow copper wire coil inductor Quantity: 20 pieces Construction: Hollow copper wire coil for inductance in RF circuits Size: 3.5 x 2.5 x 0.7 Turn counts available: 1.5T, 2.5T, 3.5T, 4.5T, 7.5T (3.5 x 7.5T x 0.7 referenced in the listing) Application: Remote control and FM inductor use, suitable for frontend tuning and RF oscillator/filter networks Material: Copper wire with hollow coil design Compatibility: Designed for Coilcraft inductors, suitable for RF tuning, filtering, and oscillator circuits in FM and remote control systems Performance orientation: Built for stable inductance in compact RF applications with a copper winding What's inside 20 hollow wire coil inductors from Coilcraft A range of turn counts (1.5T, 2.5T, 3.5T, 4.5T, 7.5T) to support different RF requirements Size consistent with the listed dimensions for easy integration into small layouts Use cases and applications FM frontend tuning: Use these inductors as part of RF tuning networks in FM receivers or transmitters to help select and stabilize desired frequencies. Remote control RF modules: Incorporate the inductors into LC oscillators or filter stages within remote control transmitters or receivers to improve selectivity and performance. RF prototyping and experimentation: A versatile supply of inductors suitable for building, testing, and refining RF circuits, oscillators, and signal filtering in hobbyist or development environments. Notes This product aligns with Coilcraft's brand specifications for hollow copper wire coil inductors and the indicated size and turn counts. Direction for use is consistent with RF circuit design practices; ensure correct inductance value selection for your specific frequency and impedance requirements.