Polystyrene Particles from Nanocs have narrow size distribution yet with multiple size selection from 20 nm to 10 microns. These particles are suspended in 1% aqeuous solution. Standard deviation of these particles is in the range of 10% of listed size parameter. These particles have wide applications in diagnostic reagents and bioassay development. They can be further modified with different surface coatings and functional groups. nanocs surface modified polystyrene particles provide more choices for in-vitro or in-vivo applications of those nanoparticles. Customer conjugation and modification is availABLe upon request.