Things I liked:Industry standard, work just fine for most applications. What others should know:Be aware these sometimes have trouble fitting the Umarex Makarov pistol. The neck is too fat on the Crosman cartridge. My understanding is that the Daisy brand CO2 have a slightly thinner neck and will fit the Mak better. Problem is, Pyramyd Air doesn't carry the Daisy brand CO2, only Crosman, so I had to order from a competitor. I would much rather give Pyramyd the business, though. Maybe in the future they will carry the Daisy brand as well.