The GRAV® Glass Blunt extends to 4" long and is made on 12mm tubing. Its outer sleeve fits around a slender mouthpiece with a pinched end designed to block ash and plant matter. The two pieces are held together by a segment of custom fitted heat shrink tubing. During use, the mouthpiece is pushed further into the outer sleeve to gradually ash the blunt and expose fresh plant matter. No accessories or water are necessary for using this blunt.