VCH Blue double sided salon tape - Extra Strong for DIY Skin Weft Hair Extensions - 3 Month Hold

Are they already pre-cut or do you have to cut them yourself?

Can I swim with these on?

I've tried walker tape and after one wash my extensions fell out. Does this tape hold after washing?

Hi There i am having massive trouble finding replacement tape for my hair extensions, does this stuff actually stick and how long for?