All three have a hand turned gaboon ebony axle. Gaboon Ebony is very strong (and very expensive!).
Prices are shipped. They are as follows:
SOLD Padauk $50.00
Weight 51 g
Diameter 55.7 mm
Width 31.7 mm
SOLD Purple Heart $50.00
Bocote $60.00 - If you are hesitant due to the weight I’ll offer a full refund if you aren’t 100% satisfied, including the cost to ship it back to me.