Feature 1BABY TRANSITION STAGE: Equipped with the first stage straw and weighting kit, so that children can learn to drink cup straw group for nipple conversion. 2GRASP AT WILL: Let the baby drink water while holding the cup at any angle with the straw weighting kit, let the baby develop the habit of drinking milk independently. 3INTEGRATE DESIGN: The ball of silicone weighted straw set, which is easy to clean and hygienic, built in cross opening, the flip is not easy to drip. 4SUITABLE FOR SMALL CALIBER CUPS: Conversion weighted straw set is very perfect for small caliber cups or bottles such as milk bottles and feeding infant bottle. 5SILICONE MATERIAL: Constructed with food grade silicone and PP material, with high plasticity and toughness, tensile strength and corrosion resistance.Item Type: Soft Conversion Weighted StrawMaterial: Food grade silicone, PPSize:20.5 x 3.7 x 3.7cm/8.1 x 1.5 x 1.5in .Package List:10 x Soft Conversion Weighted StrawsNoteThis is a standard caliber bottle accessory (referred to as small caliber), so be sure to look at the size before buying.