What are these on the speaker

What are the things on the speaker, are they resonance blk ? , where can I get them.
http://pic6.audiogon.com/i/c/f/1133108144.jpg

whatever12312-23-2005 6:39am

sbank Details Discussions Posts This discussion Message User 3,382 posts 12-23-2005 at 02:31pm Copy Comment URL Report Comment Edit Delete They look like Mapleshade products. I would recommend Walker Valid Points from walkeraudio instead. Cheers, Spencer