Interested in starting anal play but you don't know where or how to start? The Training Tool offers three different shapes and sizes for step by step progression. All are uniquely shaped for ease and pleasure. Style and Measurements: Beginner: Has an angled top to help reach and massage that right place. Measures 4 inches insertable length and 1.25 inches in diameter. Intermediate: Has a bulbed top with smaller ridges and bumps towards the bottom. Measures 4.75 inches in insertable length and 1.25 inches in diameter. Advanced: Has three bumps which will add to the pleasure. Measures 5 inches in insertable length and 1.5 inches in diameter.