Does the great god who has photography know how this strap was shot? Or do you need any tools to assist the strap to shoot like this?

generally, this kind of white background picture is taken first, and then the goods are deducted from the background during post-processing. If you want to make it simple, you can fold the whole studio and shoot this small product specially, with a shadowless bottom light inside. The direct shooting is closer to this effect, and a little processing can be done later.