4 TECTA-TIPS to fit XP Metal Detectors Mi4 and Mi6 wireless metal detector pin-pointer probes. NB. No probe is included in the sale. TECTA-TIPS protect the tip from wear through use, particularly in sand and gravel; which can wear a hole through it in no time! You would not use your coil without a cover on it so why neglect your pin-pointer probe? These are hard wearing, conform well to the angular shape and do not adversely affect performance in anyway.