Re-stocked with shuttles today, asked for AS-30 and some equivalents. I got 2 tubes each of: Yonex AS-30 speed 3 (£12.50) Ashaway Black speed 78 (£9.99) RSL Tourney No.2 (£10.25) (RSL tube lettering and colour makes them look like 2 quite different batches I think the purple tube is the older style) Having a bit of time on my hands, I thought I would weigh them all. method: 1 tube at a time weigh shuttles 1-12 repeat repeat take averages, reset scales, go to next tube (Note: for the price of the AS-30 I could have got best RSL/Ashaway shuttles: RSL No.1 or Ashaway Gold ) (Note 2: each tube of RSL had 1 shuttle that averaged at 4.73g - this is outside the weight range specified by the laws: 4.74g - 5.50g) This might tell us something about the consistency of the shuttles, i.e. how similar each shuttle is to the others in the tube, but nothing about durabillity. I usually play with Yonex 30 or 40 and can often get most of a game of singles from 1 shuttle. I've played with some half price shuttles and used 4 per game - a false economy. Anyway, here's the data. Make of it what you will.