This oblong pumice is ideally shaped for all your manicure and pedicure needs. Plastic handle makes for easy sloughing of feet, hands, elbows and knees. 6 1 – 2 x 1 1 – 2. Natural Sierra Pumice Stick is a professional standard stick to soften calluses on hands, feet, and elbows. Natural Sierra Pumice Stick. Softens Hard Skin. Mends Calluses on hands, elbows, and feet. Professional Standard. Environmental caring.