Convenient NSi wire marker Books made with vinyl impregnated cloth. A strong adhesive ensures the marking will last. Printed with black legends on a white background. Each book contains 450 wire markers. Temperature range: -40 to 250 Degrees F. Pocket-pal book includes these legends of (45) 0-9, (15) L1,L2,L3 and (15) T1,T2,T3 markers.