TOPPERFO® Bubble, these are perforated acoustic panels with different drilling diameters. Plasterboard ceilings with different hole sizes have been on the market for years. What is new and different about Topperfo® Buble is that the individual panels can be made removable and that there are two different hole patterns with different absorption values. Topperfo® Bubble # 2 with an alpha-w value of 0.5 and Topperfo® Bubble # 3 with alpha-w of 0.7 with a 56mm suspension. Both versions are available in all common surfaces of the current interior design, in the versions veneered, lacquered or coated. In addition, in all fire classes.