Allen 20mm Dynamic Blocks feature the patented Allen Dynamic bearing system which provides an unrivalled weight to performance ratio. This is coupled with our high strength and rope friendly stainless-steel ultra-strap; making them amongst the strongest and most reliable ball bearing blocks on the market. The range is available with different types of accessories including lacing eyes, hooks, swivels and cleats. The range also features a central rivet that provides great options as a tie-on becket. You’ll find a 20mm block to suit most control line applications.