How many grommet sets would I need if I plan on keeping the same frames for a few years? Ive used the nblade 98 for last 3 years and the grommets are still fine but am changing to Fischer mpro1 98 and am concerned grommets may not be available down the track. I play about 10-15 hours per week 70% on (artificial grass) astroturf and 30% on hardcourts. I do serve and volley a bit and collect the court surface digging out low volleys a few times per match. Restring every 8 weeks on average. Frames are Fischer Mpro 1 98s strung in low 50s. I know the simple answer is buy a few sets now but Id really like to know how long is a reasonable life expectancy for grommets.