The FirePen is an amazing fire starting device that causes spontaneous combustion using air. Similar to the Diesel engine, heat generated by compressed air molecules is used to ignite tinder. Can be used to ignite numerous natural tinders plus charred cotton cloth. Inovation compact design with patent pending pressure relief valve. Comes with complete instructions, Char-cloth and a spare O ring. LIFETIME WARRANTY. We will repair or replace any product that fails to perform for any reason. You may return unused product within 5 business days for full refund.