8dn-20 or 8dn-10 ?

[..SNAKEBIT..]

8dn-20 or 8dn-10 ?
what is the difference???
what do you think of using these in my Viper CPR pipes
136 x 1-1/2 for Iowa and out west?????

 

[*99sRx700*]

you have a PM, and i have a set of 8dn-10 if you need them