Comparison : Item # 28677, 0.15 Millimeter (mm) Diameter Sapphire and Ruby Ball
Item # 28678, 0.20 Millimeter (mm) Diameter Sapphire and Ruby Ball
Item # 28679, 0.25 Millimeter (mm) Diameter Sapphire and Ruby Ball
Item # 28680, 0.30 Millimeter (mm) Diameter Sapphire and Ruby Ball
Item # 28681, 0.40 Millimeter (mm) Diameter Sapphire and Ruby Ball