The description of the .375" resin ball in [HEAD-B-D-COMN-01] Frame is showing .5" Edit: It also looks like the .25" resin ball also has this description. 
The description of the .375" resin ball in [HEAD-B-D-COMN-01] Frame is showing .5"
Edit: It also looks like the .25" resin ball also has this description.