Help me get information on this boomer

Hi guys, I'm actually planning on building my first speaker, and on the electronic site I use to command the electronics componants I found a bommer (22-200Hz) which seems quite nice and is cheap (I have a low budget ^^). I was wondering if you could help me get informations on this boomer because appart from another link I haven't found anything else about it.

First link :
https://www.gotronic.fr/art-boomer-polypro-wd8-130-31530.htm
Second link :
https://www.e44.com/audio/haut-parl...e-polypropylene-130mm-50w-89db-WRB130SQS.html

Thank you !
Axel