Meteria:these are made of super-soft flexible pacifier grade silicone,safe and non-toxic, not easy to turn yellow and hard
Design:D shaped (symmetrical) 13mm length
Advantage: not only increase the height, making the eyeglasses fit you more but also keep your eyeglasses from slipping and makes glasses feel great, sit better, and eliminate any pain or discomfort .Giving you new eyeglasses wearing experience
MOUNT TYPE: Screw-in mount type, match well with various kinds of eyeglasses, sunglasses, spectacles that is screw-in style nose pads frame ,not the clip-on or push-in style.