https://gyazo.com/906fec4f0e92cd1af37443ca885bfd54
Any ideas how?
It looks like they are just tweening a parts properties using tweenservice. Are you familiar with how tweenservice works?

I meant effect like this part the black and oranges
How can it curve with Tweenservice?
It’s achievable by using a simple particle emitter.
There are many ways to do this. These ways may include tweenservice, animating the part, or using a particle emitter. You can curve an object by changing its orientation.
Object["Orientation"] = Vector3.new(X,Y,Z)
Can you give me an example on how to do that,I don’t quite understand.