The Face on this Beyblade depicts Cancer, the fourth astrological sign in the Zodiac. Its Zodiac symbol is the Crab. The bolt shows the eyes and claws of a crab in black with a red background.
Energy Ring: Gasher/Cancer
The Gasher Energy Ring is completely circular and featured in Random Booster Light Vol.1 Mad Gasher CH120FS is of a brighter red, while the BB-55 Booster version is slightly darker. Both are identical in shape and weight. It shows crabs' claws. It is also one of the heaviest energy rings. This energy ring's weight makes it an ideal choice for defense and stamina type beyblades.
Fusion Wheel: Dark
Dark has twelve spikes facing the clockwise direction. These protrusions are closely packed together with minimal space in between each, resulting in an overall round shape. This shape hinders the Metal Wheel in two ways, as its protrusions are not pronounced enough to provide sufficient Smash Attack, while the perimeter is interrupted too frequently for sufficient Stamina. Additionally, its weight is distributed over too large a a surface area, resulting in poor defensive capabilities. However, the Hasbro mold does show mediocore Defense, but is still outclassed by Basalt, Earth, Rock and many others.
Spin Track: Change Height 120 (CH120)
CH120 is unique as it features a height-changing gimmick. The user is allowed a choice of using 120 or 145 as the Track's height. This is done by rotating the bottom portion of the Track and pulling/pushing the central part out/in, and then rotating the bottom portion back to lock the height. Importantly, this can be done between each round of a match, as it does not involve any part-swapping. The advantages of this Track are plentiful. Its most obvious benefit is allowing the user to change the height of their Beyblade between rounds; this means that the user can adapt their strategy to counter the opponents during a match. CH120 is currently the only Track featuring a 120 height. This height is useful for many Attack types. T125 or D125 can be used as an alternative if you don't have CH120, but they're not as good.
When you change height, at one point you will get medium height. Keep it there, and then screw in the Face Bolt as much as you can without breaking it. The height should tighten and stay as it was. This works only with CH120 and TH170.
Performance Tip: Flat Sharp
FS is a Balance Bottom. It was released in the Hasbro release of Dark Gasher CH120FS. It looks flat to you but if you look closely it is actually a tiny sharp ball-like tip. Surprisingly when you launch the Beyblade with enough power and the tip is worn enough, it will spin around and then stop and spin in one place, but is outclassed by FB and CS.
SF is wider than Sharp but not as wide as any Flat Bottom. It was released in the Takara Tomy release of Dark Cancer CH120SF. It produces a movement pattern that, while it is aggressive, is much slower than any Flat Bottom. The increased friction with the stadium floor due to the wider tip both increases its Defense and Stamina in comparison to a bottom similar to S or ES. However, it is in absolutely no competition with bottoms similar to WD for Stamina or RS for Defense. Semi Flat is meant to be used in Balance type Beyblades, as it combines aspects of Attack, Defense, and Stamina. It has very little use, however, as it is slow.
Dark Cancer was re-named DarkGasher for Hasbro's release, and subsequently had the word "Cancer" removed from the Facebolt, and a new purple design behind the original motif. The reason behind this is that no parent would buy their children a Beyblade named Cancer due to the other meaning of it.
Dark Gasher CH120FS is the first Beyblade to have height change track, the second being Beat Lynx TH170WD.
In the anime, when Mad Gasher was turned into Dark Gasher, the performance tip also changed, from a FS tip to a SF.
Hasbro released Dark Gasher with the tip FS, while Takara Tomy released it with SF.
The Takara Tomy version of the energy ring is translucent pink where, the Hasbro version is a darker shade of translucent red.
Although it can change height, Dark Gasher is the only balance-type beyblade in Beyblade: Metal Fusion that doesn't have a 145 track.
Actually, CH120 can change from 120 to 140, not 145.
Dark Gasher was one of the beys that was transformed in the Beytransformer, the other was Evil Gemios DF145FS