£170 for both plus tyres.

Selling due to upgrade, have been really great lightweight reliable wheelset. 

Suitable for shimano 9,10,111 speed cassettes 
clincher with 25mm tyres included. 

700c 25-32 width tyres compatible 
WTS technology: Wheel Tyre System 
ISM4D lightweight rims 
Weight: Wheelset 1550g (front 680g rear 870g) 
Spokes: steel, straight pull, bladed, double butted (18 front, 20 rear) 
Rim material: Maxtal (alloy) 
Rim dimensions: height 24mm front, 26mm rear 
Hubs: aluminium with aluminium axles 
Fitted with specific front (GripLink) and rear (PowerLink) Mavic Yrksion Pro tyres 
Tyre size 25c.

Pics here: https://www.gumtree.com/p/bicycles/mavic-ksyrium-elite-clincher-wheelset....