One of the more durable indoor shafts and super accurate for your competitive needs.  Four sizes available from 300, 350, 400 and 500 spines. The CT Hippo has a .305 ID.
 
CT HIPPO XP (straightness +/-.0015" - w/Yellow print)
 
Weight in grains Size Spine
7.1 Grains per inch (gpi) - 23/500 
7.8 Grains per inch (gpi) - 23/400 
 
Comes with McKinney Nock Adapter and McKinney nocks