Extruded Solutions Ultra Cap Seal 1 1/2" Width x 5/8" Height x 23' Length EPDM Rubber (Choose 20ft or 23ft) 23ft for mounting truck caps or camper shells that weigh over 200 lbs. Fills all bed rail gaps. Complete kit includes seal, butyl tape, alcohol pads and detailed instructions Excellent compression set resistance for maximum service life and vibration absorption High quality, long-lasting automotive grade EPDM rubber seal. Preferred by professional installers over PVC/foam seals. No need to replace this seal every time your cap is removed.