1 2.125 in. x 19 in. x 13 in. ProPAD-XL set, 4pc/set, each set decouples 2 speakers The award-winning Auralex ProPADs feature a durable, three layer highlydamped construction that provides superior isolation from thevibrations and resonant energy created by the studio monitors,preventing this energy from being transmitted into the supportingfurniture. ProPADs are constructed with a flat AuralexPlatFoam base layer and includes an additional PlatFoamwedge for angled applications. ProPADs are extremely useful fordecoupling monitors and reducing structural vibrations.ProPAD & s are a premium version of our currentbest-selling MoPADs.