Physical requirements include the ability to lift and carry up to 50 pounds from ground to waist, visual acuity, speech and hearing, hand and eye coordination, manual dexterity, repetitive motion, standing, sitting, walking, climbing stairs, bending and stooping, working from a elevated position and the ability to drive. Martin Marietta's Magnesia Specialties business produces high-purity magnesia and dolomitic lime products used worldwide in environmental, industrial, agricultural and specialty applications.