The diameter of the air pellet is key to optimum performance and flight. Moreover, ensuring that the pellet is the right fit for the barrel is essential as well. Eley Tenex Airgun Pellets are offered in three diameters (4.49mm 4.50mm & 4.51mm) and are designed to help shooters find he correct size for their pistol or rifle. Excellent the range and competition shooting. The pellets come supplied with a damage resistant, re-sealable package, perfect for storing. The box is sectioned into four compartments overlaid with a foam cushion which minimizes movement of the pellets and softens the impact if dropped.