Hello Manager, RO4350B high frequency material has stable electrical properties versus frequency. So impedance transmission lines on RO4350B PCB can be stably controlled and the design of filters is repeatable. Basic specifications Base Material: Rogers Corp. RO4350B Tg280℃ Copper Weight: 1 oz each layer Board Thickness: 1.6 mm ±10% Layer Count: 2 layers Board Size: 120 x 120 mm =1up Solder Mask: Green solder mask | white silkscreen Surface Finish: Immersion gold Via: Through holes Warpage: ＜0.23% Net Weight: 0.043 kg/pcs Acceptable Standard: IPC-Class-2 Lead time for prototype: 7 working days Shelf life: 6 months Benefit: Low dielectric constant, Low dielectric loss PCB Service a) Prototype, Small runs and mass production supply capability b) Range in thickness from 10mil to 60mil c) Door to door shipping service Contact us today for more preferential price. Kevin Liao | Business development Bicheng PCB | www.bichengpcb.com| sales@bichengpcb.com |Material partners: Rogers, ITEQ, SHENGYI, TAIYO, KUANGSHUN If you do not want to receive emails from Bicheng about marketing communications and special offers, reply as “remove” in the subject line. Bicheng is located at Baoan, Shenzhen, China 518103.