The mat is a thin, fairly fragile, stringing together of moss plants, which is to bring with äüßerster caution from the plastic bag, then in order not to have a 1000-piece jigsaw puzzle in front of him. I'm not even sure if it is really Java moss. A customer writes in another review of forest moss. I have the impression also.
After delivery I've erstmal a 1cm thick filter mat concerned, cut to the measure 21x14cm and sewn downright approximately 10m thin fishing line the moss. Then the whole structure watered two days in a bucket to flush fertilizer, pesticides and all what is being used in such plantations. Finally, I am attached to my outrageously expensive shrimp. Then I have the filter mat with suction cups and is fastened to the rear wall of my aquarium. After the moss has been left on my back wall for two months to confirm my oa impression that it is a sham, but at least to an inferior Qualtät. It grows just about anything from this moss wall from algae to small two-bladed plants which then die off after a few days. Only the Java Moss itself remains on a strangely consistent delivery status (at least it will not brown). For comparison I have right next time Javamoos the expensive variant in size from 9x10cm to stainless steel mesh for 10, - Euro hung up. The difference is clearly visible. The higher-quality Java moss is deep green and grown to a length that is crying out for the first shave.
Conclusion: If you buy cheap, buy twice. At the next general overhaul the pseudo Java Moss flies back out and it is a little more invested in local Aquaristikhändler with quality Dennerle or Tropica.