There is no glue used to connect silicone and plastic. Easy to remove the silicone by pulling and separating from the plastic pipette.Easy to clean and wash. Food-grade Silicone and Plastic with a wide range Temperature tolerance from -40F to 248F hot. Each Silicone Suction Bulb is easily removable from the Pipet and is safe for use in the Dishwasher, Oven, Freezer, Refrigerator, and Microwave. Perfect for little hands, just need supervision as pieces come apart. 3+ colors may vary. Fun for cooking, science, tub time, or whatever other time you can think of to use them! Endless fun!