You are buying 1 (ONE) NEW 2 1/4" DIAMETER by 18" LONG TUBE of CLEAR EXTRUDED ACRYLIC. (Two and One Quarter inch Diameter x Eighteen inch long) This tube has a 1/8" thick wall which provides an outside diameter (OD) of 2 1/4" and an inside diameter (ID) of 2". To assure that you get the finest quality, the protective sleeve is kept in place on the tube while being cut to protect the acrylic. Saw cutting might cause small micro chipping on ends of tube as seen in the pictures. Please allow a length tolerance of +/- 1/16" and a diameter tolerance of +/- 0.020" on all pieces.