Clearsonic Sp20 Studiopac 20Includes 18 S2224 2 S2233 Clouds 4 S1248 4 S2448ClearSonic contains everything you need to produce professional sounding audio recordings for rooms up to 150 ft2. The kit features SORBER baffles for absorbing sound from the ceiling and walls, and BassTrap 4 assemblies to absorb sound that would otherwise reflect off the ceiling corners. Each kit contains: 18 S2 24 x 22" SORBER Baffles 2 S3 33 x 22" SORBER Baffles 4 BassTrap 4s 120 small touch fasteners (for wall attachment) 8 large touch fasteners