Zen Tubes 250 ct. Red King +Tube case One of our most popular brands, these tubes are the preferred brand of many customers for quality and taste. These tubes are sure to please and are currently available in both king size with a 17 mm filter length and 100 mm tubes with a 25 mm filter length. Tubes styles available in full flavor, light, and menthol. They are packaged in a 250 ct. the box which is an added bonus to an already great product.