Drilled this ball up last year for the drier conditions i experienced in the wood house i bowl sweepers and sub in. I drilled this ball 5 1/2 x 4 1/2mb. Pin over bridge and mb just right of the thumb. Even though the coverastock is rated S30 (a weak rating compared to their other balls) it plays much stronger. This ball is very rolly on the back end and very controlable even though it hooks substantially more than i anticipated. I took the surface to 4000 plus Storm Diamond Gloss and it helped greatly. With a slightly stornger layout this would be a very good choice for slower speed bowlers on a med THS.