These suction cups are used to attach objects together Suction cups have so many uses for finished crafts They are great for hanging hand made decorations especially at Christmas Will suction onto any glass windows or mirrors Use for suncatchers ornaments Christmas lights stained glass projects etc This pack contains 6 rubber suction cups with metal hooks Available in clear color Each cup measures 22mm wide The measurement is the size of the cup before it is attached as they expand when attached Made of rubber material