This study compares the ability of a new design of brachytherapy seed for prostate seed implants for treatment of prostate cancer to maintain their intended position in the prostate after being deposited. Standard seeds, especially in apical locations, have a tendency to migrate distally in response to muscular forces. AnchorSeeds have a textured coating which is designed to prevent migration. 40 patients who are eligible and suitable for prostate brachytherapy will be randomly assigned to receive either standard seeds or AnchorSeeds.