The present application provides a roller bearing system comprising one or more bearings having a plurality of substantially hemispherical members. Each member includes an interior. A sleeve is disposed within each hemispherical member interior and configured to accept a shaft that passes through each hemispherical member, such that the hemispherical member turns about the shaft. Each also includes at least one stem coupled to the shaft. The stem is configured to provide a point of attachment to a particular bearing.