Mybecca XL Studio Speakers Monitor Pad 2" x 9" x 12" Foam Isolation Platform Recoil Stabilizer Speaker Risers, 4 Pack Platform Size: 2"H x 9"W x 12"L | Wege Size: 1.5"H x 9"W x 12"L (approx.) Each pack comes with a (1) Platform and a (2) Reversible Wedge Eliminates high frequency sound waves for 70-80% Great for Studio Monitors, Amplifiers, Subwoofers, Loudspeakers, Shelf Speakers, Portable Speakers, etc. Product Care: Occasional vacuuming