Long time lurker, first time poster. I've been in the Bujinkan for many years and have amassed a sizable collection of training equipment, but as many BJK practitioners would know, many training weapons commercially available work for training, but they aren't ideal. Short tsuka, thin bokken, small tsuba, lack of tsuka and durability problems are a few specific issues when thinking about bokken. I have recently come into a business opportunity which would allow me to design and manufacture premium polypropylene bokken (would we still call it a bokken or would it be a kasoken 可塑剣?) and I would like to get some feedback on my design ideas and if anyone would be interested in this product. The base product would be a set of three weapons, daitō, shōtō and tantō each with their own plastic saya. But unlike available products from suppliers like Coldsteel, these weapons would have bronze or brass tsuba [hand guard], kashira [pommel] and menuki [tsuka decorations]. The tsuka-ito would also be cotton in a variety of colours (thinking green, red, blue and yellow for initial runs). The daitō and shōtō would have significantly larger tsuka than commercially available bokken. Daitō would have 35cm tsuka and Shōtō 21cm tsuka. Tantō I'll probably keep shorter at about 16cm. Their tsuba diameter would also be much larger than commercially available versions at 8cm^2 (or 7x8). A major difference for this set is that all three weapons will have a plastic saya (which aren't available commercially for shōtō or tantō. Blades will all remain in the standard black polypropylene it is manufactured in. The main purpose of this set is to have a closer feel to the real thing (nice fittings and cotton tsuka-ito), a durable safe blade that can be bent and bashed without deforming, a saya for drawing practice and weapon dimensions that are more in line with western body sizes (hands/height). Calculating production costs, I could probably get away with $150 to $200 USD for the set. Based on the success of this project I would also go on to create other sets of polyprop weapons that you don't see on the market like jutte, kabuto wari, rokushakubo and so on. Thoughts and feedback appreciated.