I accidentally bought this, so it's only been opened. I'm also selling a different type of tube, so please take a look if you'd like＾＾ The transparent tube is compatible with the Solo electric breast pump and supports efficient milk expression. - Model Name: Tube for Solo Electric Breast Pump - Color: Transparent/Yellow - Purpose: For milk expression - Compatible Products: Eligible for Nekopos (Japanese delivery service) Thank you for looking.