Waterproof Sokkia Loose Leaf Transit Field Book sheets are printed with waterproof blue and red inks on fine quality 50% rag ledger paper specially treated to give "high wet strength." Paper retains its strength and working surface when dried, even after being subjected to extreme weather conditions. All sheets are universally punched to fit all standard six-and three-ring binders. Single sheets are ruled on both sides and used consecutively. Transit Field. 4 1/2"W x 7 1/4"L, Pkg. of 50.