Today there are many different options when it comes to practice pads. We have many different types of pads for concert playing, marching bass drum, and even a timpani practice pad. You need to first decide what you are planning on using your practice pad for.
If you are looking for a pad that you can use to warm up for and practice you snare drum parts, a normal rubber pad will do just fine.Some of these come with an additional harder side that is meant to be more of a ‘work out’ pad. This is a harder sided surface with less rebound for a work out. The size of the pad does not make a difference.The smaller 6” pads are sometimes easier to carry around in a stick bag.
There are several drum pads out there made specifically for marching drums. Vic Firth offers a marching bass drum practice pad that fits onto a cymbal stand. There are several different tenor/quad pads out there as well. These feature typical tenor set up, coming in a large or small version. The marching snare pads such as the Vic Firth StockPad or the Off World Invader V-3 pad are meant to replicate the feel of playing on a high tension snare drum.
Some practice pads have an 8mm mounting thread that will attach to any cymbal stand. The Remo practice pad is different, it has a 6mm mounting. It only works with the Remo Pratice Pad Stand.
Otherwise most pads will fit on to any type of snare drum stand. It is important to get a 'concert' height stand, as this will allow you to practice standing up. Some manufactures has stands that are speficilly designing for practice pads.