In all honesty, the Boulder Pure XL Crimps PU is one of our favorite sets. It includes five big, sleek, and rounded crimps. Their thin, long shape makes them perfect for bouldering, real forearm destroyers. If you want a larger version, check out the Boulder Pure Mini Volumes 6 set to finish your route. The additional screw holes let you place these holds in different positions and ensure a more secure attachment to the wall.