Feature: Made of high-quality material, non-toxic, tasteless, non-polluting. Insulation, heat insulation, cold resistance and exposure. Closed cell, good sound insulation. Resilience and high tensile strength, strong toughness, good shock/buffer performance. The dust cap is covered on the speaker to prevent dust. Various sizes optional to meet your different needs. Specifications: Item Type: Speaker Dust Cap Material: paper Size: 74x15mm/2.9x0.5in, 85x21mm/3.3x0.8in, 55x13mm/2.1x0.5in, 65x14mm/2.5x0.5in, 45x9mm/1.7x0.3in, 47x11mm/1.8x0.4in, 42x9mm/1.6x0.3in, 38x8mm/1.4x0.3in, 65mm/2.5in, 92mm Color: Black Uses: speaker dustproof/beautiful decoration/phase correction