Soft Glass Tubing 2.5mm Dark Blue (10 Foot Piece) Soft Glass Tubing has the look of frosted glass with the feel of Silk. This hollow tubing slides easily over almost any size Wire or Flexible Stringing material such as Griffin or Beadalon, to create a fun, colorful look. Outside diameter: 2.50mm Inside diameter: 1.5mm Length: 10 feet Color: Dark Blue