Box of 40 White Elephant 9mm Meerschaum Pipe & RYO Cigarette Filters Our filters are perfect for pipes and roll-your-own cigarettes. The two flat ceramic caps are environmentally friendly and very heat resistant, the paper hull is chlorine-free. Meerschaum is well known for its remarkable smoking characteristics. The material is a magnesium silicate from the mineral group of the sepiolites, the porose structure is able to absorb large amounts of moisture like a sponge and reduces moisture and harmful substances and brings you a mild and dry smoking experience. Only the highest quality of Meerschaum, imported from Turkey, is used. Environmental friendly packaging.