This 3M 391X air release tool is a retractable, very small pointed tip used to puncture a vinyl bubble and release the trapped air.This is a video that Fellers, the world's largest wrap supply company, asked The Wrap Institute to make for their catalog.
These two classes of consonants are the plosives and fricatives. Plosives are the kinds of sounds usually associated with the letters p, t, k; b, d, g, in which air flow from the lungs is interrupted by a complete closure being made in the mouth.
Each consonant retains its distinctive mouth move, but sometimes the individual phonemes are blurred a bit to make a smooth sequence. For example, the /d/ and /r/ at the beginning of drive, when clustered, veer toward /jr/, which is how they sometimes appear in children's invented spellings.