DescriptionMade of high grade material, it is skid-proof, and it will give you a good experience. High grade and can be used for a long time. Form a cover over the eye during an eye exam. An eye test can be done anywhere, at home or at work.Features-Material: Polypropylene. -Made of high grade material, it is skid-proof, and it will give you a good experience. -Hand-held design, this eye occluder also can last for a long time of use. -It is a very important tool for vision test in the school, and it can bring much convenience to you. -Great for vision examination equipment, essential supplies for optical shops and optometrists. -Anti-slip and ergonomic handle design, not easy to fall off when in use, comfortable to hold.