These Milo Freezer Teethers are made with 19 mm baby safe silicone beads. They’re made with cold temperatures in mind. We didn’t add any wood products to these Duke Teethers so that you can put it in the fridge or freezer when ever you need a quick fix for your cranky baby’s aching gums. The cool temperature helps relive the throbbing pain and will hopefully brighten up baby’s mood. Teething can be exhausting for both you and baby.