我的另一支後備球拍Head Extreme Pro一直都是穿Black Code，同一幅線用了3年半，線床並沒有出現任何死亡的跡象，而且越打越舒服，實在想不出為什麼會這樣。

這次選的是Tecnifibre新出的Black Code 4S 18g/1.20mm，第一次穿這麼纖細的網球線(原來還有更細的19g!)。一般來講，球線越細，控制力越好，當然也更容易磨損，希望遲些時候試拍的時候這幅新的Poly可以帶給我一個全新的體驗。

另外聽了經驗豐富的師兄建議，這次拉的Tension是52lb (Main) x 50lb (Cross)。

Black is Back! With Black Code 4S, Tecnifibre gives big hitters a durable, low-powered co-poly with MASSIVE spin potential, impressive tension maintenance and great feel (especially for a firm monofilament). Boasting a square profile and sharp edges, this string puts a very tight grip on the ball. Topspin players will be able to hit high-arching, spin-loaded balls that come down sharply and explode off the court. For this string Tecnifibre uses Thermocore Technology, a multi-stage heating technique designed to soften the structure and reduce harsh impact vibrations. This helps explain why our playtesters were so impressed with the comfort level. Players looking for a durable co-poly with phenomenal control and spin-potential should definitely give this one a serious look. Try this thin 18g for more spin and feel than the other gauges.

• Gauge: 18g/1.20mm
• Length: 40ft/12.2 m
• Composition: Co-polyester with Thermocore Technology.
• Colors: Black

Update: Feb 12, 2016

Blackcode Guage 18 doesn’t feel right, as it’s too thin and too stiff, probably need to lower the string to 45-48lbs. Also just re-strung another racket with Black Code 17 (previous one got broken during a match after almost 3 years, yeah!), 50lb (Main) x 48lb (Cross), it feels much much better this time, I shall stay at this range from now on.