Astro Pneumatic Sanding Belt 120 Grit 3/8” x 13” 10PC BSP120 The Astro Pneumatic Sanding Belt 120 Grit 3/8” x 13” 10PC BSP120 includes 10 high quality belts for any sanding job. Astro Pneumatic provides the essentials needed to keep the shop running smooth and organized providing the highest quality in the industry to assure you get the job done right.