Refillable and economical. [Uses] Water thread for surveying. [Functions and Features] Water thread is lightweight and does not drip even after extended distances. Comes in a case that protects the threads from dirt. Can be used while in the case. Comes with a cutter for thread cutting. Economical use of water refill (sold separately). [Specifications] Thread Color: Fluorescent Yellow. Thread Thickness: Approx. 0.04 inch (1.0 mm). [Materials] Case: PET Product Size (W x H x D): 2.4 x 5.5 x 2.4 inches (60 x 140 x 60 mm); Weight: 4.2 oz (126 g); Product Code: 4960587057001; JAN Code: 4960587057001; Brand Name: Tumi / Product Name: Civil Engineering Water Thread, Yellow; Standard: No. Includes a line cutter Please be careful.