Elastium

Elasitum is a special type of metal, forged and perfected by Saizen Kinsei. After long studies and extended periods of time spent in creating this metal, Saizen managed to forge a special material of metal in order to create an ultimate defense, which would be deemed indestructible without spending tremendous amounts of chakra. Saizen played with the chemical structure of his metals in order to create something similar to the Lava Release rubber techniques, yet in metal form. This led him to forging Elastium. Elasitum is deemed to be indestructible. However, it's not due to the sheer durability and strength in the metal. Rather, it's a result of the elastic nature of the metal. Elastium is silver, it bears the color of most of Saizen's metals. It appears to be an ordinary metal at first, very hard and strong. However, when put under tremendous force, instead of breaking, it acts like rubber and stretches in order to absorb the impact of the force, in an instant, it returns to its original structure, after the force was absorbed, the speed of its comeback is equal to the force put on it.

Its elasticity is only apparent when put under an immense amount of pressure, as Elastium doesn't stretch that easily. The user can easily increase the elasticity by altering the chemical formula slightly in order to make it like rubber. However, Saizen prefers the former usage. This metal was able to withstand a Tailed Beast Ball and moving it out of Saizen's direction by utilizing the elasticity to redirect the attack. Elastium is an excellent electric conductor as it can conduct electricity with ease, which can be used to redirect Lightning Release attacks or electrify the opponent. It has a high melting point. However, fire release seems to be the best option when dealing with Elastium. However, it needs to be put under a tremendous amount of heat in order to alter its form even slightly. Even Madara Uchiha would have to direct flames constantly at the Elastium for a long period of time in order to melt it. Saizen's biggest surprise was that Elastium was able to sustain even his Ikken Ishi, which was one of his strongest attacks.