Transparent slide whistle with packaging designed to show children how sound works. Eg: A large chamber produces a low note, a small chamber produces a high note. The transparent tube allows child to visualise the chamber size changing as the sound changes. Perfect for science projects.
![Elis New Skin Feel (For Heavy Day to Regular Day Use), without Wings, 26 pieces x 2 packs [Menstrual Napkin]](https://www.buildvision.shop/image/elis-new-skin-feel-for-heavy-day-to-regular-day-use-without-wings-26-pieces-x-2-packs-menstrual-napkin_m6bv1b_300x.webp "Elis New Skin Feel (For Heavy Day to Regular Day Use), without Wings, 26 pieces x 2 packs [Menstrual Napkin]")
