Easton Superdrive Micro Shafts 950 1 doz Black 950. Specifications for Easton Superdrive Micro Shafts: Manufacturer: Easton Color: Black Features of Easton Superdrive Micro Shafts: Specifically engineered for outdoor competition Weight Tolerance: +/- 1.0 grain Straightness +/- .002" GPI: 8.1gr Nock Pin Adapter: #4 Package Contents: Easton Superdrive Micro Shafts Easton 430825: Superdrive Micro Shafts 950 1 doz Black 950