^^^
https://stringbox.com/faq
"We will provide a box that you will package your racquet(s) in and a pre-paid label. You will have the choice of our in-stock strings, or, if your favorite string isn't available, you can always select any other string that can be bought in stores. You will have shipping options including taking your box to a local FedEx or UPS store or leaving your box on your doorstep to be taken directly to our professional stringer."
"Stringbox works with professional stringers close to you to make the turnaround time competitive, or even quicker, than taking your racquet to your local club or sports shop. We offer three shipping options outlined below: standard, expedited and concierge service.
Standard: Our standard shipping option is included in the cost of your order. You can expect to receive your racquet in 8 to 9 days after placing your first order. For example, if you place your first order on a Sunday, we will send your boxes to you on Monday. You will receive them on Wednesday or Thursday. If you drop your racquet off at a FedEx location on Wednesday or Thursday, our stringer will receive it on Thursday or Friday. We will string and send it back out the day after we receive it. You would receive your racquet a day or two later. Each subsequent standard shipment would only take about 5 to 6 days for you to receive since you will already have boxes to use to send your racquet to us.
Expedited: This shipping option is offered for $5 and would allow you to receive your racquet within 5 to 6 days after placing an order. An example of expedited shipping is as follows. If you place an order on a Sunday, we would have your boxes to you by Tuesday. If you drop your racquet off at a FedEx location by Tuesday or Wednesday, our stringer would receive it Wednesday or Thursday. We will string and send it back out on Thursday or Friday so that you have it by Friday or Saturday. Future expedited orders would only take 4 days to get to you, after placing an order, since you will not have to wait to receive boxes to send your racquet to us.
Concierge: Our most convenient option, the concierge shipping option is offered for $10. This option allows you to leave your packaged racquet on your doorstep and we will arrange for FedEx to pick up your package and ship it to us. After placing your order, it will take approximately 6 to 10 days to receive your finished racquet. An example of this option would be as follows. If you place your first order on a Sunday, we would have shipping boxes to you by Tuesday. You could now schedule your shipment to be picked up either Wednesday, Thursday or Friday. Our stringer will receive your racquet the day after it is picked up and it will be back to you 2 days later! Subsequent concierge orders would only take 4 to 6 days since you will not have to wait to receive your boxes."