Borosilicate optical fiber is an efficient, effective method for moving light. Many application needs can be met with borosilicate glass fiber assemblies. This fiber transmits well in the visible, from 370-1700nm. Borosilicate glass fiber is typically small in diameter (<100um), with a thin cladding and no buffer. This allows it to be more flexible and have a very tight bend radius – perfect for small spaces. The high core to cladding ratio makes borosilicate fiber ideal for tight packing into bundles. Bundles can contain hundreds to thousands of single fibers, maximizing light collection and transmission, and offering valuable redundancy in case of fiber breakage. Borosilicate fiber also boasts a larger numerical aperture, making it well-suited to spectroscopy and sensing applications requiring efficient light collection. The large number of fibers used in a borosilicate fiber bundle makes it ideal for light manipulation.