High Density and High Elasticity SpongeThe insulation pad is made of high-quality sound-absorbing foam (density 50kg/m3), high-density and high elasticity sponge material, combined with appropriate structural design, can effectively reduce the resonance of sound vibrations and make the sound more real and accurate. Get the best sound effect. Each block has two pads. Each sound pad corresponds to the left and right speakers. You can choose from 5 different angles (0, 4, -4, -8) and 2 adjustable heights to find the best sound. Note: the smaller foam pads can also be used alone as speaker isolation. Crushing resistant, not easy to deformThe black insulation pads measure 28 x 19 x 4 cm (11 x 7.5 x 1.6 inches). Because they are crush-resistant, they will not easily deform and can support up to 13.6 kg (30 lbs). Suitable for all speakers 5" (12.7 cm) or smaller, including Yamaha HS5 HS50, KRK Rokit KRK RP4G3 RP5G3, M-Audio BX5, Adam F6, Alesis Elevate, Klipsch rR 150 m and others! Isolation Pad PrincipleProduces cleaner, more accurate sound by reducing vibration and distortion in the lower area. It produces more accurate and precise bass reproduction and improves clarity in studio monitoring by eliminating resonances in the room. Whether you need sound control, damping or a precise sound environment, these foam pads have you covered.