The clear crystals are held in place by the rubber base, which helps to reduce the resonance in the case from the speaker.
A na-emepụta spikes ndị a iji belata ọkà okwu si n'ala, nke na-enyere aka belata ntụgharị nke abụọ nke ihe ndị ọzọ n'ime ụlọ ahụ.