The Westside BT Swan is a straight putter that has a very low fade and made with BT Soft plastic (formerly Eco1). PDGA approved.
BT soft plastics properties:
This soft plastic is used for Westside putters only. It is firm in your hand, yet tacky which makes it great for grabbing the chains. The BT soft plastic is less durable than VIP and Tournament plastics. BT soft plastic is suitable for players at all skill levels.