JRC CONTACT Lines – CM50 Monofilament; CM 50 is a high performance co-polymer monofilament, designed as the most reliable carp fishing mono on the market today. Its extra high shock resistance and knot strength means the angler can fish for BIG fish with confidence. The high-vis opaque yellow colour is perfect for fishing applications where the angler needs to know where his lines are and can fish with confidence, without cutting off.