Coaxial electrospinning is a new technology for the preparation of multi-structure nanofibers. with the advantages of simple equipment operation. mild processing conditions and adjustable structure. This technology uses a direct current (DC) high voltage electrostatic field to continuously transform a variety of polymer solutions into multi-structure nanofibers. https://www.countryscenesaddleryandpetsuppliers.shop/product-category/hole-punch/