This is a piston ring set of 3 for an Associated or United hit miss gas engine.  They are 3 3/4" diameter and 1/4" wide and will work for any engine with a 3 3/4" bore and 1/4" grooves on the piston.  They are new and have never been used.  The pictures tell the story.  I can be reached at 262 573 193 1 if you'd like to talk about them.   Good Luck.