Moose Labs is on the leading on of smoke filter technology with its products. The smoke in your bong passes through these filters, catching much of the tar and resin in the smoke that would otherwise build up in your lungs. These provide a cleaner and safer way of smoking - you will be able to notice the different instantly with how smooth these hit and never go back to natural hits. If you're not a bong person and prefer joints, this is a perfect option for you too! The joint filter not only blocks our some tar from the joint, but also ads as a crutch to hold it without burning your fingers. You only need one mouthpiece of joint piece, and then you can buy replacement filters for each!