I’ve made 10 so far. I have enough materials to make 20 and ‘thought’ I made 20 shells, but I only printed 14. I’m not sure if I should start selling now or when I have all 20 made. Also, I’m going to increase the price to $39.95 $59.95 each. I’m doing this because of all the design time, labor assembling, ordering parts, shipping supplies, packaging and shipping. It’s a small business amount of work. If anyone reads this, thank you for following along on my journey. It makes me very proud that people like my sliders. I put my heart and soul into them and do the best I possibly can to make a precision product.