Optimized Particle Composite System. The Point 4 optimized particle composite system is formulated with highly consistent particle distribution and particle size to provide strength, polishability and vitality. With an average particle size close to 0.4 microns, the direct composite material is said to provide aesthetics, optimal working characteristics, and tooth-like strength. Kit Shades A2, A3, A3.5, XL2 and T1 are supplied in 0.2g Unidose tips..