Based on mineral and vegetable tanned leather, molded joints offer high resistance to perforation, tearing, bending, abrasion and traction. Its exceptional physicomechanical capacities (flexibility, resistance, absorption capacity) make it a material that compares advantageously with composite materials. This leather will also be able to resist to water, oil and air. The leather material does not fix itself as it ages. It will marry continuously her contact materials and their roughnesses of wear.