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Lightning-X Istros I4 4 Accel-S is an Attack Type Beyblade released as part of the Burst System as well as the SlingShock System. It was released in western countries as a SlingShock Single Pack.

Energy Layer - Lightning-X Istros I4

Main article: Energy Layer - Lightning-X Istros I4
Lightning-X Istros I4, despite the "Lightning-X" prefix and "I4" suffix, is simply a recolored Istros I2. As such, one should refer to the Istros I2 page for more information.

Forge Disc - 4

Main article: Forge Disc - 4
4, like other even numbered Core Discs, is symmetrical and elliptical in shape in order to facilitate a Disc Frame. Each side features two protrusions, one molded into the shape of a "4" and the other molded into the shape of the Roman Numeral "IV". The protrusions extend further from the center more than other Core Discs which grants 4 high Outward Weight Distribution and subsequent Stamina potential. As a Core Disc, 4 is comparatively heavier than regular Forge Discs such as Heavy and Gravity which grants higher KO resistance and the ability to facilitate Disc Frames can add characteristics such as Life After Death with Cross or Glaive. While 7 has greater Stamina, 4's Stamina is still comparable.

Performance Tip - Accel-S

Main article: Performance Tip - Accel-S
Accel-S, as its name implies, is a SlingShock Performance Tip based off of Accel. However, unlike the original Accel, Accel-S is slightly taller and it features two gaps on either side of its cylinder base, which is meant for the activation of its “SlingShock Mode”. As a part of the SlingShock System, Accel-S can be manually altered to switch between “Battle Ring Mode” and “SlingShock Mode”; in this case, by twisting the tip clockwise, pulling it downwards, and twisting the tip clockwise again, and vice-versa.