This is not a fixed type commonly found in mass-produced products, but one that allows you to adjust the magnetic brake while fishing. Why not aim for ultra-long casting with a non-contact magnetic brake, instead of the centrifugal brake that utilizes friction? You can find your preferred setting because it is infinitely adjustable by turning the screw. This product utilizes existing holes and frames, so there is no impact on the reel body, such as drilling. To prevent the screw from falling out, reuse the E-ring originally attached to the main body. Operation has been confirmed only with models equipped with a line alarm for the Ambassador 6500, so it is unknown whether it is compatible with other models. Included items: Base parts, 2 magnets, adjustment screw, spacer *Please note that there may be some burrs or color variations due to 3D printing. Please understand that we are not responsible for any issues such as scratches or damage to the reel caused by using this product.