Dispensing Tips (also known as dispensing needles) come in a variety of gauges, lengths, and threads... as well as a variety of materials like PTFE-lined, flexible polypropylene, stainless steel, brush, blunt end, angled blunt end, and tapered dispensing tips.
Tips are excellent for precisely applying adhesives and filling/potting materials. They typically affix directly onto the ends of 2-part mixing nozzles and allow for more control when applying to specific, tight, narrow, and otherwise small surfaces.