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Betromoth B2 Down Liner is a Balance Type Beyblade released as part of the Burst System as well as the Dual Layer System. It was released in western countries as a Single Pack for USD$7.99 in the United States.
Energy Layer - Betromoth B2
Main article: Energy Layer - Betromoth B2
Betromoth B2 is an overall round Energy Layer, the center of the Layer depicts a beast, like the Layer's namesake, biting down on the circle where the "B" of the Layer resides.
Consisting of a colored bottom layer made up of two jaw like arches and a clear top layer consisting of five, widely spaced blades creating a pinwheel-esque look, the "jaws" and ends of the clear blades of the Layer are covered in small serrations like teeth. While these features may imply that this Layer has a lot or recoil, the height of the Layer means that typically both layers come into contact with the opposing Beyblade and fill in each other's gaps and the slight serrations are too small to cause any noticeable recoil and subsequent Stamina loss.
The Takara Tomy release of Beast Behemoth also features three tall teeth akin to Victory Valkyrie, allowing it to be used in Defense combinations with its moderately low recoil.
Forge Disc - Down
Main article: Forge Disc - Down
Down features a dropping shape akin to Armed and Vertical with thin bands that connect the interior of the Disc with the weighted nubs along the bottom portion. Like all other Forge Discs, it features two tabs with stylized 'D's that protrude from the top to fit into the slots of an Energy Layer.
Down's design is meant to lower the center of gravity on a Beyblade, doing so increases a Beyblade's stability and reduces the risk of floor scrapes. In addition, the wide shape of Down focuses much of its weight around the perimeter, giving this Disc excellent Stamina properties and giving Attack Combinations greater aggressive movements with its Flywheel Effect.
However, Down has two features that give both advantages and disadvantages: The first is weight, Down's average weight means that its KO Defense is sub-par compared to more popular choices such as Heavy or Gravity, but at the same time gives more Burst Defense than the aforementioned Discs. The second is height and shape, while excellent for stability and Stamina, the weighted nubs create a rough perimeter and the low positioning makes it easy for said nubs to contact the stadium floor late in battle when spin velocity is low, rendering any Life After Death null. However, the low center of gravity helps resist listing and Destabilization to prevent such contact.
Performance Tip - Liner
Main article: Performance Tip - Liner
Liner is a Performance Tip that features a free-spinning wheel that's positioned vertically. As its name suggests, Liner features a "Stabilization" gimmick that is meant to realign the Beyblade; in this case, through the use of its free-spinning wheel.
At first, depending on the parts used, Liner is mostly stationary and easily takes refuge in the center of the stadium. However, once struck by the opponent, Liner's free-spinning wheel will move, creating a somewhat erratic movement pattern, and thus, theoretically, will retake refuge in the center of the stadium. In practice, the Beyblade is easily capable of heading back into the center when struck, and thus Liner's "Stabilization" gimmick works as intended.
At the same time, this gimmick also allows the Beyblade to counterattack the opponent, and at times, potentially KOing or Bursting the opponent. Sometimes, this even results in continuous head-on collisions. However, while this may imply Attack potential, Liner can become unbalanced, which acts as a "double-edged sword"; as the unbalanced nature, while it is beneficial in Attack Combinations, can also increase the risk of Bursts and creates poor late-game Stamina. This also makes Liner ill-suited for Spin Equalization Combinations, as the late-game unstable spin of the tip's wheel will prevent the Combination's Layer's rubber from making direct contact with the opponent.
As such, Liner is best suited for KO Defense Combinations; as the ability to quickly get from the Tornado Ridge to the center of the stadium allows it to avoid potential KOs than most other Performance Tips, such as Atomic.