Formerly known as Black Diamond Racing. LM Discs extends and smooths treble response, improve bass weight and smooths treble response, and greatly enhances mid-range clarity and presence. LM Discs are designed to match the tip of the Pyramid Cones and are dimpled on one side. We recommend using them under the Pyramid Cones for an incredible upgrade. Just slip a set under the stock feet of any piece of gear to hear an instant difference. The LM Discs can be used under speaker spikes or under any equipment rack, as each LM Disc can handle over 180kg.