copy of an email I sent to ricorshocks regarding their vibranator handlebar vibration reducing thingies recently : Hi Brian Just a note to say how unhappy I am with the result of installing vibranators on my 06 (steel frame) wr450. They made such a massive reduction in handlebar transmitted vibration (stock renthal bars) that my son (who previously could only ride the bike for about 10-20 minutes before his super sensitive hands went numb) wouldn't get off the bike and I am now stuck riding his bike. He is so much faster on my bike than I am - it is very discouraging. We have fitted vibranators to a kdx200 and wr450 with excellent results and to a ktm 250sx with lesser but still worthwhile results. Many thanks for an excellent product.