Socket structure for the ball of a ball point pen refill

For use in connection with a ball point writing instrument refill, the combination of:

• a multi-layer bearing socket having an outer supporting shell comprising therein an outer dispersion layer of a substance selected from the group consisting of chromium nickel, and an alloy containing at least one of the metals chromium, nickel, silver and copper, said alloy having dispersed therein a carbide portion with a hardness exceeding 600 kg/sq. mm Vickers;
• an inner lining supported by said outer disperson layer arranged inside said outer shell and firmly connected thereto, said inner lining having a hardness of less than 200 kg/sq. mm Vickers, and a ball slidably engaged and embraced by said inner lining.