This parallel ruler for marine navigation is lightweight allowing you to achieve stable use. it comes with Raxene Bag makes it easy to carry. HIGH TRANSPARENCY This navigation parallel ruler has high transparency, the clear scale for Precise and accurate measurement. Function Description The parallel ruler is used for drawing azimuth lines or navigation lines and measuring azimuth line degrees or course line degrees when map operations are performed. Package includes: 1 pcs brass parallel rulers, each measuring 45cm/18 inches in length. Flexible Operation This parallel navigation ruler is easy and flexible to use, just follow the actual needs and routine operation. BRASS & ACRYLIC MATERIAL This parallel ruler is made of Brass and acrylic material, pure Brass spacer is polished, not easy to oxidize, and with stable surface. This parallel navigation ruler is easy and flexible to use, just follow the actual needs and routine operation. BRASS & ACRYLIC MATERIAL This parallel ruler is made of Brass and acrylic material, pure Brass spacer is polished, not easy to oxidize, and with stable surface. Package Contains 1 Pc of Navigation Bar & 1 Raxene Bag