It's much easier to do with surgical needles than regular needles. The problem is getting them. Sterile acupuncture needles can be easily obtained online in varying length if you want to experiment but skewering through the entire ball is difficult because the needles are too thin and bend way too easily. I bought a whole bunch of 5 inch needles and tried to skewer both balls at the same time. The needle went through one alright but when it hit the second it penetrated and did a 90 deg bend and kept going.