Datadart Rob Grundy Darts – Steel Tip – 90% Tungsten – 23g. Each pack contains 90% tungsten, straight ringed barrels, Rob Grundy pear flights and Datadart signature shafts.Datadart Rob Grundy Darts – Steel Tip – 90% Tungsten – 25g. Each pack contains 90% tungsten, straight ringed barrels, Rob Grundy pear flights and Datadart signature shafts.Datadart Rob Grundy Darts – Steel Tip – 90% Tungsten – 24g. Each pack contains 90% tungsten, straight ringed barrels, Rob Grundy pear flights and Datadart signature shafts.