I have had a Trauma ER for a few years and this ball has been great. It lost some reaction last season and I had it resurfaced for the second time. No luck this time, it still did not perform like I expected. I'm looking for a replacement. The ER is 15#, 3" pin, 4" x 4" drilling, no balance hole. I throw with decent speed 16-17 mph, medimum revs. Lanes are wood with typical house shot with medium oil, can be heavy some nights. I like to throw it over 10 out to 6. The ER has been great on almost any condition and I am looking for a go to ball to replace it. Must be a Storm.