Marine Urethane, Inc. builds every type roller used on pipelay barges worldwide. These are classified as: · Idler or guide rollers - straight cylindrical rollers with integral shafts and outside bearings. · "V" Rollers - Hourglass shaped rollers for conveying pipe longitudinally. May have outside or integral bearings. · Drive rollers - have integral shaft with keyway for sprocket or gear to turn roller. · Stinger Roller - Have internal bearings and rotate about a fixed shaft.