Remember those little rubber cushions you used to see on everyone's pencil in 3rd grade? Someone had the good sense to stick one on a bow, and voila! The VioTech Suregrip comes with two precisely shaped cushions for your bow. Unless your bow is missing its grip and winding, you will probably want to have a luthier install this.
No, these do not fit on a standard No. 2 pencil.