Very stable tracking. Rough surface like pear skin provides very precise reaction to your mouse movements. Strong against a sweat or dirt, humidity : you can use same quality even sweat your hands while playing. Features: Surface : Amundsen fabric, micro-control version Middle layer: Single-bubble rubber foam by a special structure Bottom:Non-slip. Hardness: SOFT Edge:Stitched Edging Control:high-efficiency moving in playing gaming. *Colors may vary slightly from batch to batch. These have a slightly different feel than the Strata series but smoother than the original black model.