ROYAL BLUE DIAMONDBACK VIPER BMX"
Excellent shape; bike was received as a gift & ridden fewer than 10 times
 20-inch frame with rush brakes, 16-inch wheels,
 $100, OBO. (Bike sells for around $190 new.)
(412) 521-4503

Here's a link from a bike store to show  what my son's bike looks like  http://shop.sunrisecyclery.com/item/191731?gclid=CPmgis2GzbUCFcme4AodXHsArg
(except, again, his bike is royal blue, not green).

Thanks!
-Nancy