It has double bonded laminated float glass for windows that are crystal-quality, weatherproof, and unbreakable. The implant is made of medical silicone unbreakable rubber. An ideal spring is taken to be massless, frictionless, unbreakable, and infinitely stretchable. Tension forces can be modeled using ideal strings that are massless, frictionless, unbreakable, and unstretchable. This has bearing on the design of provably unbreakable cryptographic algorithms. In addition to being unbreakable, the lasso was also infinitely elastic. The trilogy consists of "Unbreakable" (2000), "Split" (2016), and "Glass" (2019). He compared this mindset to M. Night Shyamalan's approach to superpowers in "Unbreakable". Vinyl records were, over-optimistically, advertised as "unbreakable". This earned them a shot at the NWA World Tag Team Championship at Unbreakable. Jackson herself would comment on the album's legacy on her 2015 album "Unbreakable". They worked on an album titled "Unbreakable", but it was never finished. In 2000, Bruce Willis was quoted as hoping for an "Unbreakable" trilogy. The first single, "Unbreakable", was released on January 25, 2013. This became "an unbreakable (and notorious) habit".