Organic Plug Areng Wood Rhino (OG19) - In addition to the mixed wood organic plugs and tunnels, the single wood plugs and tunnels offer another choice. Available in various materials from 6mm up to 20mm diameter. N.B. Organics - reduce odour, are lightweight and warmer in cold weather. Remember to only wash with mild soap and water, and dry afterwards. Remove organic jewellery before swimming or bathing. Keep dry to avoid damage. PLEASE NOTE: As these are natural, hand-made products, sizes may vary by up to 0.5mm (very small).