Made of 1.6MM doublesided fibers board. Durable base for stable electrical and mechanical performance. Using factorydesigned lar inductors, the parameters are consistent and the performance is more stable. Provides reliable, repeatable behavior across units. All resistors use fivering tight resistors (fivering resistors have small error and work more stable). Helps reduce tolerance variation and improves circuit stability. The bottom of the board is mostly filled with tin (can be used for induction heating). Tin plating supports heat dissipation and potential induction heating applications. Applications and use scenarios Induction heating projects and small induction heater modules that benefit from a tinplated bottom for heat handling and stable components. Prototyping current or precision circuits where consistent inductors and stable resistors are critical for predictable results. Educational and lab setups to demonstrate the impact of stable inductors and lowtolerance resistors in practical circuits.