RIO's Mainstream series of fly 
lines have been developed to meet the overall needs of the average and 
novice fly fisher, and are designed to optimize rod performance with 
slightly heavier and shorter head lengths. Every Mainstream line 
undergoes the same rigorous production processes and quality control 
standards as all RIO fly lines, and is made in RIO's Idaho manufacturing
 facility. Each line is built with a slick coating on a supple 
memory-free core, for the best in performance. 

Slightly heavier than standard lines for easy loading
Supple core with a slick coldwater coating 


Line Size / Color / Sink Rate / 30ft Head Wt / Head Length /
Total Length   

WF4S3  Brown  3-4 ips  133gr
/ 8.6gm  38ft / 11.6m  80ft / 24.4m   

WF5S3  Brown  3-4 ips  155gr
/ 10gm  38ft / 11.6m  80ft / 24.4m   

WF6S3  Brown  3-4 ips  178gr
/ 11.5gm  40ft / 12.2m  80ft / 24.4m   

WF7S3  Brown  3-4 ips  204gr
/ 13.2gm  42ft / 12.8m  80ft / 24.4m   

WF8S3  Brown  3-4 ips  231gr
/ 15gm  42ft / 12.8m  80ft / 24.4m