The clusters have five brass inserts with female UNC 6-32 threads to attach up to three soft markers (included). Each cluster is held in place on the body with a Fabrifoam SuperWrap strap (included). Replacement straps may be ordered separately.
Sold as a set of two clusters, including three markers and one strap per cluster.
Replacement markers: soft markers – 15mm neoprene base. https://www.qualisys.com/accessories/markers/soft-marker/
Weight1: 18 g
Dimensions: 103 × 80 mm (4.1″ × 3.15″)