Unbelievable that this sprocket is celebrating it's 20th year in production... I guess true classics never get old.  The BSD Superlite Sprocket can be seen here in all it's glory.
 
– Fully CNC’d dual thickness sprocket
– Super tough 7075-T6 construction
– 8mm thick at the edges for strength
– Tapers to 6mm at the center to save weight
– Centre hole 24mm, supplied with both 19mm and 22mm top hat washers to fit all cranks
–  Weight, 25t – 70g, 28t – 90g