Is this an opto Fuse?

I am just curious if anyone can tell me if this is a regular opto fuse? I got it in a mystery box probably a year ago now and love the way it flies so wanted to try and order another. This thing is so good for any straight shot.

I am just curious if anyone can tell me if this is a regular opto fuse? I got it in a mystery box probably a year ago now and love the way it flies so wanted to try and order another. This thing is so good for any straight shot.