New Ricta Wheels Crystal Cores feature Ricta’s new optically clear high performance 95a urethane They are transparent on the outside and have a black core on the inside. These wheels are super cool! 95a high performance urethane offers a more forgiving durometer for rough terrain with easy, consistent slides you’d normally only get on harder wheels Ricta’s latest core design provides optimal speed, reduced rolling resistance, and maintains shape integrity on landings for easy rollaway