Billfisher Plastic Thimbles are luminous for rigging applications where luminescence is beneficial.  Plastic thimbles are also lighter than stainless.  Like there counterparts they are designed to protect monofilament and cable from chaffing.   They are used for rigging offshore lures, birds and spreader bars.   They also work well on cable shark rigs.  Available in one size that fits up to 400lb mono.   Sold in a 50pk