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Lightning-X Istros I4 4 Accel-S is an Attack 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 SlingShock Single Pack for CAD$9.99 in Canada, USD$7.99 in the United States, and AUD$13.99 in Australia.

Energy Layer - Lightning-X Istros I4

Main article: Energy Layer - Lightning-X Istros I4

Despite the "Lightning-X" prefix and "I4" suffix, Hasbro's Lightning-X Istros I4 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 (OWD) and subsequent Stamina potential. As a Core Disc, 4 is comparatively heavier than regular Forge Discs such as Heavy and Gravity which grants higher Knock-Out 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.