I had some Knight sabots for back when they first came out with them must be around 15 years ,my friend just getting into muzzleloading bought a Knight big Horn and I gave him some bullets and those sabots and he got 1.5 inch for his first group. Like sabotloader I store them in airtights [zip lock] and ammo cans so limit air and no light I suspect that if you left them in sunlight very long it would cause deteration. Lee