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Mountain-X Galaxy Zeutron Z4 12 Defense-S is a Defense Type Beyblade released by Hasbro as part of the Burst System as well as the SlingShock System. It was released in western countries as a part of the Element-X Pack for USD$19.99 in the United States.

Energy Layer - Mountain-X Galaxy Zeutron Z4

Main article: Energy Layer - Mountain-X Galaxy Zeutron Z4

Despite the added "Mountain-X" prefix, Hasbro's Mountain-X Galaxy Zeutron Z4 is simply a recolored Galaxy Zeutron Z4. As such, one should refer to the Galaxy Zeutron Z4 page for information on performance.

Forge Disc - 12

Main article: Forge Disc - 12

12, like other even numbered Core Discs, is symmetrical and elliptical in shape in order to facilitate a Frame. Each side features three protrusions with the center protrusion in each set featuring molding in the shape of a "12" and four holes in the center, akin to 6. While the aggressive design of the Disc may imply high Burst potential from Disc-to-Layer contact, due to the fact that most Burst Performance Tips are of the same height, such contact is rare. Furthermore, 12's design is so aggressive that there have been numerous cases of the Disc severely damaging Layers that collide with it. Finally, 12 is the lightest Disc at the time of writing, lighter than even Armed which severely hinders Attack, Defense and Stamina potential. While the light weight would create high Burst Resistance, the heavy weight of the SwitchStrike/God Layer System and the Cho-Z Layer System makes the use of lightweight Discs for Burst Resistance obsolete.

Performance Tip - Defense-S

Main article: Performance Tip - Defense-S

Defense-S, as its name implies, is a SlingShock Performance Tip based off of Defense. However, unlike the original Defense, Defense-S' ball tip is significantly taller and it features two tabs on either side that are connected to the ball tip, which is meant for the activation of the Performance Tip's "SlingShock Mode". As a part of the SlingShock System, Defense-S can be manually altered to switch between "Battle Ring Mode" and "SlingShock Mode"; in this case, by sliding the tabs to the other side, and then pushing both tabs downwards, and vice-versa.