This kit from Pepetools is all the radial disk you will need to get started polishing. The kit includes a handy organizing kit and all grits in 3 sizes with a mandrel. 

4 each of the following (Radial Discs)

• 5/8" Radial Disc 
• Yellow - 80 Grit (Coarse)
• White - 120 Grit (Medium)
• Red - 220 Grit (Standard)
• Blue - 400 Grit (Fine)
• Pink - 600 Grit (Pumice)
• Peach - 6 Micron (Extra Fine)
• Light Green - 1 Micron (Ultra Fine)

• 7/8" Radial Discs
• Yellow - 80 Grit (Coarse)
• White - 120 Grit (Medium)
• Red - 220 Grit (Standard)
• Blue - 400 Grit (Fine)
• Pink - 600 Grit (Pumice)
• Peach - 6 Micron (Extra Fine)
• Light Green - 1 Micron (Ultra Fine)

• 1" Radial Discs
• Brown - 36 Grit (Ultra Coarse)
• Dark Green - 50 Grit (Extra Coarse)
• Yellow - 80 Grit (Coarse)
• White - 120 Grit (Medium)
• Red - 220 Grit (Standard)
• Blue - 400Grit (Fine)

1 each of the following (Mandrels)

• Wheel Mandrel (1/8" x 1/16")
• Wheel Mandrel (1/8" x 1/8")
• Wheel Mandrel (3/32" x 1/16"