Amber Plastic Graduated Ovals. Each case of vials is sold with twist off child resistant caps to prevent children from getting into them. Lightweight transparent amber ovals graduated in ounces and milliliters. Colored prescription bottles are ideal for packaging and dispensing light-sensitive liquid medication. This is because of their ability to prevent ultra-violet light from damaging or degrading any photosensitive medication, and they let enough light in to see the contents. 5 per pack.