Pyramid three-dimensional square design diffusion panels, made of lightweight material for easy installation. Can be attached with push pins or double-sided tape. - Colors: White, Beige, Black - Shape: Three-dimensional square, 22 x 22 cm ⚪︎ Masking tape has been applied to the corners of the boxes to prevent the panels from falling out. I applied it because the boxes sometimes fell apart due to weak structural integrity. ⚪︎ Used with removable double-sided tape and push pins compatible with wallpaper, so there are holes and tape marks on the boxes. ⚪︎ Some items are without boxes because I disposed of the boxes to save storage space. Box-less items are included as a bonus. The effect is still present without the frames. Some people make their own. ⚪︎ There are stains and peeling due to aging. These items are useful for easily tuning the acoustics of an audio room. I remember they cost around 3000 yen each. Please consider this item with the understanding that it is used.