Is the SL-RS700 sold as a pair or individually?

It is sold as a set — both the left (front) and right (rear) shifters are included.

Does it work with Shimano Ultegra or 105 rear derailleurs?

Yes — the SL-RS700 uses standard 11-speed Shimano road cable pull ratios and is compatible with all 11-speed Shimano road rear derailleurs including Ultegra RD-R8000 and 105 RD-R7000.

Shimano

Shimano SL-RS700 I-Spec II Flat Bar Shift Lever Set

Name: Shimano SL-RS700 I-Spec II Flat Bar Shift Lever Set
Brand: Shimano
SKU: ISLRS700IPAL
Price: 11580.00 INR
Availability: InStock
Author: InstaSport Editorial

₹11580.00

Description

For flat bar road bikes, the SL-RS700-I 2 x 11-speed shift levers from Shimano with I-Spec II mounting provide reliable and intuitive shifting. The RAPIDFIRE PLUS lever features 2WAY-RELEASE and quick Multi-Shift action. FEATURES I-Spec II - securing the shift lever on the brake lever RAPIDFIRE Plus