Easy to use ICE-SIP makes your drinks INSTANTLY COLD, The freezer straw has a inside tube , and you simply fill the tube and place it in your freezer, no more messing with ice trays that when you fill them water is all over the floor and half the time the tray get's wet and freezes hard inside your freezer ! With ICE-SIP freezer straws, you place the tube inside the re-useable straw housing and when the water has frozen , just place it inside your drink and "WA-LA" Instant cold, no more watered down drinks , just pure "drinking pleasure".