The inflatable silicone sound has a length of approximately 9-1/2” and uninflated it is 7mm in diameter. Be sure to test the inflation prior to each use, and how rapidly the sound inflates. Insert slowly. Pump the bulb gently to inflate the sound. The sound will begin to inflate approximately 2” from the end. Do not overinflate. The widest the sound should be inflated is 25mm (the size of two adult fingers).