1Rubber Material: Scope eyepiece cover is made of multi fold rubber, providing ample flexibility as a comfortable cushion and preventing recoil. 2Relieve Eye Fatigue and Improve Target Focus: Relieve eye fatigue by blocking glare or enhancing weak light. Improve target focus by eliminating interference from surrounding motion. 3Rapid Eye Positioning: Scope eyepiece cover can achieve rapid eye positioning to achieve appropriate eye relaxation and optical center alignment, thereby enhancing target capture and aiming accuracy. 4Focus and Aim At Target: With this eyepiece eye protector, you will be able to easily focus and aim at the target, while protecting your eyes from harm. 5Quick Installation and Applicable Range: The rubber scope eyepiece cover can be quickly installed and is suitable for the optical telescopic sight of 40mm eyepiece.