Mark your mat in minutes, no tools required, no weight added to mat, minor adjustments can be made quickly. Simple, discreet, and easy to use. The Protection Racket 9022-01 Drum Mat Marker Pack Numbered, Each pack includes thirty stand feet markers numbered 1-10 with 3 sets of each, ten corresponding stand markers numbered 1-10 plus one each of the bass drum and hi-hat markers.