Exmark MK724Q Used 72" Mulch Kit. This item is designed for use with Exmark Lazer Z S-Series riding mowers. Standard-setting and continually innovating, the Exmark Lazer Z zero-turn mower is the go-to for landscape professionals across the country. Exmark's best commercial zero-turn mower, the Lazer Z comes in all shapes and sizes to tackle the toughest jobs you throw at it.