I've used similar earplugs before. Specifically the Etymotic Research ER20's and DownBeats EarPlugs. Both can be had on amazon for less than this drop ($13 and $14).
I'm not sure exactly what these provide better than the competition but I strongly recommend some for loud concerts. Once in I forget about them.
lastzeroI prefer the DownBeats as they have a nice case and are less noticeable. They make a better seal in my ears where the ER20's would need adjustment and hurt after extended periods due to their longer length. Note I have large ears with small ear canals. Your results may vary. These earplugs are very similar to the DownBeats.
ResultsMayVaryFor the curious, there's a link to Downbeats. http://www.amazon.com/dp/B00ODE0IDS/175-6708980-0346207 By Amazon prices it's $13.95. Both have tax, at least for me, but you save the shipping cost and $1.04 for the item price difference. I'll be getting these and trying them out. Thanks.
EDIT: Price to that is a flat $13.95 so yeah good price savings compared to here, if you have Prime.
I'm not sure exactly what these provide better than the competition but I strongly recommend some for loud concerts. Once in I forget about them.