Nonabrasive foam head is the same size as the sample area on Indicating FTA Cards to facilitate sample application This is a noninvasive device for the collection of saliva and cheek buccal cells. Sterile Omni Swab features a unique brush-like swab head that easily ejects from the stem of the swab for transfer of samples into tubes and multiwell plates. Sterile Omni Swabs are presterilized and individually wrapped for single use.