These are very well made, took a little bit of time to get all the way. it was such a tight fit over the JL speakers but they fit very snug and are tight and strong over the speaker so they do not bend or cave in at all. The speaker also does not touch the grill despite the long excursion. If you have exposed JL audio subs you need these they are like day and night. The back on my SL600 has a big speaker box inside the cabin where the cargo area is and I can still put groceries and boxes over the speakers with zero damage to them.