Very happy with the work & craftsmanship of the product. Mine is flawless. Even has dimples on the bottom to help keep the block elevated so that liquid will not pool around it. It's drilled for 43# sized axels but still hugs enough to hold #44 BSA for cub scout axels. It is a non-absorbing block of practice. I haven't used it a sharpie on it yet. But I'm sure it will most likely wipe right off with alcohol and a rag. Keep up the good work Gravity X.