boss tin non toxic lead free refill size 6. one size of split shot per container. boss tin bosstin is a fishing accessories manufacturer committed to non-toxic, environmentally friendly fishing products. we deal exclusively in lead free fishing weights to help ensure fishable waters for generations to come. these split weight refills are small, handy containers that may be used by themselves or to refill any of our dispensers.simple, quick, and affordableenvironmenatlly friendlyproducts are lead free