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[NO ELBOW]: Only 2 pcs short tube , elbow connector not included. [IMPROVED DESIGN]: The design structure of the original rotating part has been improved to be simpler, and then the material has been upgraded to be stronger and not easy to be pierced. [ROTATABLE PARTS INCREASE FLEXIBILITY]: Precisely designed and improved to preserve the original rotation positions, which relatively strengthens the flexibility, and effectively reduces the twisting and knotting. [DURABLE QUICK-RELEASE BUTTON(CLIPS)]: The quick-release button is made of durable material, easy to install, and has enough tension to prevent it from falling off. [PACKAGE CONTENTS]: These are the improved replacement tube assembly for AV which is more durable and flexible.