Well gentlemen... ive honestly have to say ive never heard of a "filtered blunt" i dont see how there is one... ive been rolling blunts for about 3 years now... and when i roll them i dont see how u could shove some kind of cardboard in it.... Just roll it tight and nice and theres no need my friend... By the way with Delta Uk 9 comment thats funny how in the UK they think its a waste of weed for ablunt... ahh.. anyway its standard here to when u and ur buddies just have a dime or a few grams that its standard it must be all rolled up into a blunt no questions.. :thumbsup: