• Avid India Marbles & Granites

• Camara Slate Products

• DSA Deutsche Steinzeug America Inc.

• Dakota Granite Co.

• Gladding, McBean

• Haoxingda Stone (Xiamen) Co., Ltd.

• IBP Glass Block Grid System

• Impression

• Ludowici Roof Tile

• Marble Trend Ltd.

• Oaks Concrete Products Ltd

• Structural Slate Company

• Urban Invest

• Vande Hey-Raleigh Mfg., Inc.

• Vermont Structural Slate Company, Inc.

• deXstone LLC.