tecnifibre ice code 200m rulleIce Code is a very durable, round shaped polyester tennis string and is considered the most powerful polyester string from Tecnifibre. The string is perfect for players looking for a stiff string with a lot of speed. Durability: high Playability: high energy on returns Arm friendliness: medium absorption of vibrations With Thermocore technology (High Crystallinity Degree Process Polyester), a process that provides flexibility despite a rigid material.