10mm Kellner, 12.5mm Huygen, 15mm Kellner, and 20mm Huygen. This low priced set of eyepieces are great for public star parties, no point in risking damage to your high dollar eyepieces. The Huygenian eyepieces are also great for solar viewing or solar projection since there are no cemented doublets to over heat. The full set are 1 1/4" eyepieces with black anodized aluminum housings and chrome plated brass barrels. The quality is really quite good, and they are NOT made in China. They work best in longer focal ratio scopes, f/8 and above. $40 will get the full set of four to your door within the US. Shipping would be higher outside the US.