Most damper gels come in one size and ask that you cut smaller sizes if you want them smaller, but Slapklatz giving you multiples saves you the hassle.
No other gel on the market has a small plastic cover, these help prolong the lifespan and out of all the gels I've played, these last far longer.
The presentation case is fantastic quality, and you only need to buy it once as you can just buy the refills, which again, no one does it but Slapklatz.
TIP, if you don't want anyone to know you are using gels (for whatever reason) buy. the clear ones.