Keson fiberglass reinforced tapes are designed to withstand more wear and tear than any other type of measuring tape. These tapes contain more fiberglass strands for greater tensile strength and superior accuracy when tension is applied. Temperature correction is not necessary and a proven dielectric strength of 200,000 V/M is your assurance of safety from electrical hazards. New Dual-Sided 2-Color Fiberglass Tape Measures Two sided color makes grauations easier to identify. White side is always feet and inches, yellow side is 10ths or metric. (Exception: 10ths & metric, 10ths-white side & metric-yellow.) All KESON fiberglass tape measures are double PVC coated to offer greater resistance to wear. 18 Series 10 Series 1810 Series 18M Series 10M Series Metric 1 Sided Metric 2 Sided