The reverse tapered spool corrects the winding shape and reduces spool vibration.

Shimano is dedicated to minimizing the inertia of spools, as this reduction can significantly enhance the performance of baitcasting reels. A low-inertia spool enables a rapid acceleration of rotation, allowing anglers to cast lightweight lures swiftly and with less effort.

Shimano has consistently refined the design of spools for baitcasting reels.The "MGL SPOOL III", represents the third generation of these advanced spools. This model boasts significantly lower inertia compared to its predecessors, enhancing performance and casting efficiency.

• Comparison of the cross-sections of MGL SPOOL II and MGL SPOOL III
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The figure illustrates a comparison between the cross-sections of "MGL SPOOL II" and "MGL SPOOL III". Notably, "MGL SPOOL III" demonstrates a remarkable reduction in inertia while maintaining exceptional durability, showcasing advancements in thin-walled spool design.

This low-inertia spool rotates effortlessly, enabling longer and smoother casts. This capability extends your reach to distant targets that would typically be unattainable, significantly enhancing your chances of attracting bites. Additionally, it allows anglers to execute precise, low-trajectory casts with exceptional accuracy.

This spool has successfully reduced weight without compromising its remarkable strength, elevating your casting experience to new heights. Once you cast with it, you’ll truly feel the difference.

The figure illustrates a comparison between the cross-sections of "MGL SPOOL II" and "MGL SPOOL III". Notably, "MGL SPOOL III" demonstrates a remarkable reduction in inertia while maintaining exceptional durability, showcasing advancements in thin-walled spool design.

This low-inertia spool rotates effortlessly, enabling longer and smoother casts. This capability extends your reach to distant targets that would typically be unattainable, significantly enhancing your chances of attracting bites. Additionally, it allows anglers to execute precise, low-trajectory casts with exceptional accuracy.

This spool has successfully reduced weight without compromising its remarkable strength, elevating your casting experience to new heights. Once you cast with it, you’ll truly feel the difference.

The balance of the spool with the line wound on it has a significant impact on cast-performance.

Building on the advancements of the "MGL SPOOL III", which emphasizes low inertia through its ultra-thin design, the newly developed "MGL SPOOL IV" takes performance to the next level. It has achieved an optimal spool shape with a unique reverse taper design, enhancing both functionality and efficiency.

The spool, expertly designed for balanced line winding, minimises shaking during rotation and significantly dampens vibrations while casting. This innovation delivers an exhilarating casting experience, making it feel as though the line is effortlessly unfurling into the distance.