The Water Gear Resistance Bells features soft and comfortable foam padded hand bar that reduce the white knuckle effect. High quality closed cell EVA foam is non-abrasive to skin & fabrics. Foam will not chip, break or absorb water. Color coded by resistance level (Ultra/Blue/Yellow: 99% resistance) These are used. Some marks from that use, but there are no marks have disrupted the integrity of the foam materials. My name is very lightly visible on the inside of each dumb bell. The dumb bells measure 5" Width x 5.75" Diameter. The foam handles each measure 4.5 Length". Each measures 15" in total length.