What do the following numbers mean?:

Taken from website: http://www.henryjames.com/henry-jame...-dropouts.html
9.4/10.7 Rear Horizontal Road - No Eyelets (Pair) DO-RHR94
$35.50
Out of stock
9.9/11.5 Rear Horizontal Road - No Eyelets (Pair) DO-RHR99
$35.50
Out of stock
8.9/10.7 Rear Horizontal Road - No Eyelets (Pair)