Sparx Deburring Block Set Jocks Compression This custom set includes two This custom set includes two custom Sparx deburring blocks one Sparx block with a replaceable abrasive pad for regular steel and one Sparx block with a replaceable leather strop for coated or black steel The new high flex point has been optimized for catching pucks along the boards and clearing the zone making them easily removable when it's time to replace them This custom set includes two custom Sparx deburring blocks one Sparx block with a replaceable abrasive pad for regular steel and one Sparx block with a replaceable leather strop for coated or black steel