The three anorexic Sally variants, Tall Anorexic Sally, Anorexic Sally and Short Anorexic Sally all have a 3 inch cap and use 1/4 inch aluminum tubes. The anorexics are very quiet and won't disturb the neighbors. Tall Anorexic Sally has tubes that measure from 18 inches to 14 inches, Anorexic Sally has tubes that range from 14 inches to 10 inches and Short Anorexic Sally has tubes going from9 inches to 5 inches.