Check the listing for details. 2 sets German silver Double Bass Strings, E A D G Contra Bass Strings. Color: Silver, Condition: New. Listed at 25.38 USD. 2 sets of DOUBLE BASS String G D A E,4/4-3/4 UPRIGHT BASS Strings nickel silver stringsThe diameter of the strings as followes G: 1.3 D: 1.77 A: 2.18 E: 2.8About shipping: We will provided you a tracking number after they be shipped. Usually we will send them by E-packet, China Post Air Mail or EMS, the tracking number will be provided after sending to you. This is not a fast delivery service, which may take about 7 days to 30 days to arrive, or some countries may take longer time, which will depend on China post. If you need a quick delivery, please contact me. Feedback: Please leave us positive feedback if you have received your order and are satisfied. We will do the same for you. If you are not happy with the products or service, please contact us before leaving us the negative feelback, we will solve the problem untill you are satisfiedReturn & Guarantee: 30 Days Money Back--If you are not satisfied with any products you purchased from us,if the items are damaged in the shipping,please contact us and give us the picture. you may return it within 14 days for a full refund less the shipping. Of course, the item must be returned in original condition. One Year Guarantee--We will repair or replace anything that proves defective in materials or workmanship in the first year.