Feature:-100% brand new-Fits any bolt with diameter 6.2MM.-Users could control turn on or turn off when they need. -if you need the nocks lighted，then put the pin into nock，let's the the cathode contact each other. -if you don't need it lighted， then just transfer the both end.it is very easy.-Same plastic color as the light-Material:ABS-Color: Blue，Red，Green，Yellow-Size:44*6.2mmNote: This is not a toy， do Not shoot at peoplePackage included:6 x Led Lighted Arrow Nock