If your Alesis Kit features a mesh bass drum head, we recommend avoiding the use of a felt beater.
This is because felt beaters can cause early wear and tear to mesh drum heads, due to increased friction from the felt. It's recommended to turn any dual-sided beaters (which are supplied with some Alesis Kits), around to use only the plastic side.
For any mesh kits that do not include a kick pedal, such as the Strike Pro and Strata Prime, we recommend using beaters made entirely of plastic, wood, or metal. Keep in mind, unlike acoustic drums, the material used in the beater will not have any effect on the sound produced.