Includes (2) 13904 Backing Pads. New, Bulk Packed. Genuine OEM replacement part. Consult owners manual for proper part number identification and proper installation. Compatible with: Porter Cable: 332 Type 1 Random Orbit Palm Sander, 332 Type 2 Random Orbit Palm Sander, 332 Type 3 Random Orbit Palm Sander, 333 Type 1 Random Orbit Palm Sander, 333 Type 2 Random Orbit Palm Sander, 333 Type 3 Random Orbit Palm Sander, 333 Type 4 Random Orbit Palm Sander, 333VS Type 1 Random Orbit VS Palm Sander, 334 Type 1 Random Orbit Palm Sander, 334 Type 2 Random Orbit Palm Sander, 334 Type 3 Random Orbit Palm Sander, 334 Type 4 Random Orbit Palm Sander, 334 Type 5 Random Orbit Palm Sander