High quality aluminum stirrups with rubber grip tread and spring loaded outside release for safety. When pressure is applied to outside of stirrup like in a fall the side of the stirrup will open all the way up allowing the foot to be released. No way to get hung up in these stirrups. Available in 3 great sizes for any age rider. The easy way out of a bad situation! Small size (4 3/4 x 4 1/4 inside measurement, 6 1/8 outside height, 3 x 1 1/4 tread, .7 lbs.)