Product overview These are 5 magnetic ring cores, model T1301, made from iron powder and finished in blue gray. They are designed for frequency and radio frequency applications and help improve conversion rates in power conversion and signal circuits. Key benefits Improves conversion performance: Iron powder composition and T1301 form factor support stable magnetic behavior at frequencies, helping converters and inductors perform more efficiently. Reduces interference and noise: Suitable for RF chokes and EMI suppression tasks where controlling stray electromagnetic noise is important. Easy to integrate: Standard T1301 size and toroidal shape are compatible with common coil winding techniques and standard PCB and enclosure layouts. Durable and consistent: Iron powder construction provides repeatable magnetic properties for consistent results across multiple cores. Main features Quantity: 5 pieces per set Model: T1301 Material: Iron powder core Color: Blue gray ring Function: Magnetic toroidal core for frequency and radio frequency use, intended to improve conversion rates and assist in inductance and noise suppression Compatibility and size Specified as T1301, intended to fit typical toroidal winding setups that use T130 series cores. Works with common coil winding methods and can be used in various power conversion and RF circuits where T1301 cores are required. Practical applications Switch mode power supplies: Use as inductors or coupled cores to help improve conversion efficiency and stabilize switching performance. RF and communication circuits: Deploy as choke cores or part of matching networks to reduce interference and shape frequency response. DIY electronics and prototyping: Suitable for building custom inductors, filters, and transformers for hobbyist and projects. Notes for use Verify T1301 size fits your winding plan before assembly. Windings and number of turns determine final inductance and performance; test in your target circuit to tune results. Store cores in a dry environment to prevent surface contamination that could affect winding. This pack provides five consistent T1301 iron powder toroidal cores in blue gray, suitable for frequency and radio frequency circuit designs and power conversion tasks.