FeaturesUltra wide ab roller with built in resistance and ergonomic handles to help maximize results of ab roll out exercisesInterior kinetic engine uses a carbon steel spring to provide resistance and amplify abdominal and arm workoutUltra wide wheel tread offers stability when carving left right or center for targeted work on obliques DO NOT use if you are over 300 lbsErgonomic hand grips are angled to activate arm and core muscles handles are removable for easy storage and transportIncludes high density foam kneepad for superior comfort Downloadable 21 day workout plan 1year manufacturer warrantyDescriptionThe Ashcom Fitness Ab Carver Pro is an ab roller with built in resistance to help maximize muscle growth and definition in abdominals and arms A kinetic engine comprised of a durable carbon steel spring offers resistance on the rollout and assistance on the rollback to amplify ab and arm workouts Perfect Fitness Ab Carver Pro features an ultra wide wheel tread that increases stability when carving left or right to work obliques Ergonomic hand grips are angled to help activate arm and core muscles handles are removable for easy storage and transport Durable high density foam knee pads are included for superior comfort while carving