I was happy to get this clutch yesterday from a female that hasn't produced in over four years. I was starting to think I just had an oversized rat eating machine on my hands after this long. She's my largest female ball.....about 4000 grams. No special genetics going on here or anything, just a really nice black back bred to a gold stripe male (not genetic) for the last three years and she finally decided to produce 11 good ones for me this year.....Lance