BioTouch Mosaic Components Needle Caps (small, medium, large, flat) The Front Casing is a replaceable part for the BioTouch Mosaic machine. It fits over the needle during a procedure and can be adjusted to set a desired needle length. Pack Quantity: 20 pcs / Box or, 50 pcs / Box Cap Configurations: Small Cap, Medium Cap, Large Cap, Flat Cap Single use only item. Please note, the BioTouch Mosaic Machine requires the following components to be replaced after each use: Needle Needle Cap Needle Sleeve Front Casing Transmission Shaft Failure to replace all components after each client risks cross-contamination of bodily fluids (e.g. blood) between clients, risking disease and infection.