G = material thickness outer ring = 1., 1 mm. [Compatibility] The rubber edge is compatible with a variety of subwoofers from different manufacturers Nylon Corner Stake Trimview | S85250 C = diameter inner bead = 155 mm. A = outer diameter = 187 mm. RS PRO 7716982 MINIATURE SPEAKER 8 OHM 0.3W 13MM Explore a range of butyl rubber surrounds and kits for speaker repairs and DIY projects at The Speaker Exchange D = inner diameter = 142 mm. E = bead height: 6 mm. [Improved sound quality] By replacing the old and damaged rubber edge, the sound quality of your speaker is significantly improved Speaker Surround Lautsprecher Technik - Focal 7C04 Re-Foam Repair Kit Simply Speakers Durable and durable: The surround is durable and hard-wearing and ensures long-term use of your speaker