Steel. Ball arrived a little bound. Broke it free, but still somewhat tight. Maybe I push the limits of precision. Popped it out and replaced with 1/4" ball. Works smoothly. What a diff <0.3mm makes...
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What's in the Box
new 3 7 combined
in Transparent Acrylic
2.996 cm1.294 cm3.044 cm
1.18 in0.509 in1.198 in
This model is 3D Printed in Transparent Acrylic: Firm translucent plastic with a smooth surface and rubbery feel.