The Slime Balls Bam Margera Hardline 54mm, 95a Wheels Bam's new Slime Balls guest wheels featurepurple and black 95a high performance urethane with custom Bam Margera artwork by Todd Bratrud. Slime Tech 95a high performance urethane offers a more forgiving durometer for rough terrain with easy, consistent power slides and bark you normally get with a harder urethane. Hardline shapes feature a wide road surface for stability and consistent slide with a hard edge and conical cut for controlled tricks on coping and edges. Slime Balls Wheels: It's Always Slime Time.