Organic Plug Sono Wood with Crocodile Wood (OG7) (formerly WP4) - In addition to the plain wood organic plugs and tunnels, the mixed 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).