ASSureBite Cytology Brushes are delivered as SINGLE USE only. Cytology Brushes are manufactured with stainless steel wire contained in a TFE sheath to provide near frictionless operation. All brush tips are 3mm diameter for easier sample collection. Cytology Brushes utilize the highest quality materials and workmanship. Cytology Brushes are shipped sterile, packaged one instrument per pouch, with ten pouches per carton.