Product Description Explanation: 1. Tube: Triangular Tube, Lemon Tube or Star Tube (the details see the content Tube in the left side) 2. Colour: Yellow or Black (the details see the content Safety shield in the left side) 3. Safety Shield: W or S (the details see the content Safety shield in the left side) 4. Length: the Length from Cross Center to Cross Center(LC); Overall Length(L)