... 1.mineral wool ceiling 2.environment-friendly 3.hight quality and reasonable price Detailed product description meterials mineral cotton , compound fiber ... 14mm, 15mm ,18mmpatternsand blast,pineholes,little star,lovely swormfounctionfireproofing,sound-absorbing, warm-keeping ,heat insulatingapplicationopen office, studio, clean ... corridor,theater , meeting room,places needed special sound effect