DiagPoly™ Multiple Fluorescent Polystyrene Particles, Flow Cytometry Grade, 3.0-3.4 μm (# DNS-SPR11) contains a single population of polystyrene particles that are fluorescent in UV, Violet, Blue, Green and Red channels of flow cytometers. Every particle contains a mixture of fluorophores that enable the particles to be excited during systerm set-up at any wavelength from 365 nm to 650 nm.