Four (4) genuine Kingman Spyder factory replacement black rubber ball detents. Fits most newer Spyders including the MR100, Electra, Pilot, Fenix and Advancer.  Sells for $6.95 each!  May fit other models but no guarantees.  This is NOT a universal part!  It only fits newer Spyders. May fit other markers including Piranha and Spyder-clones but no guarantees. Package of 4. 

Note: this is a direct factory replacement part so it will not void any warranty.