Nylon Spacer 1/4" Thick, 1/2" OD 0.194" ID, 10 Pack for VEX Robotics Now sold as a 50 pack: Search for B073T27Z9R on Amazon. Length: 0.25" (1/4") OD: 0.5" (1/2") ID: 0.194" Include 10 Round Nylon Spacers