The Ultra should be able to, not sure if the Trinity can, never tried. The highest Panda's gone on the Ultra is 37lbs. ECP and were no problems, it was still "strong". So, Panda thinks 40lbs. ECP should be doable. Panda has not tried anything higher than 32lbs. ECP on the Trinity which held up fine. The frame on the Trinity, by design, is thinner so it's not as strong as the Ultra. Panda estimates 34-35lbs. should be the max doable/playable tension on the Trinity. When Panda says "doable", Panda means, the racket can be strung at said tension and playable without the racket compromising its structural integrity, relative speaking. With the exception of a few of strings, at 32lbs. ECP or higher, there nothing really durable. At that tension, Panda worries more about the string than the racket.